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Protein During a Deficit · the Muscle-Preservation Playbook
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In one pass When you lose weight, the body does not burn only fat.
Educational content, not medical advice — consult a clinician.
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Chapter 1
Why weight loss isn't only fat loss
When you lose weight, the body does not burn only fat. Part of what leaves the scale is something you did not want to lose: skeletal muscle.
This is the body's default in an energy shortage. The brain runs almost entirely on glucose, and when you go without food, the small store of sugar in the liver runs low fast. Amino acids are then taken out of muscle, sent to the liver, and rebuilt into glucose to cover the gap, a step called gluconeogenesis. Muscle is also a tissue that costs a fair amount of energy to keep, and if you do not use it, the body treats it as an expense it can cut. So fat and protein get taken apart together.
This can be negotiated: eat enough protein, and give the muscle a signal it can use (strength training), and you help it stay. In one small 4-week trial, young men in a large calorie deficit who trained hard and ate a high-protein diet even gained a little lean mass. It was a proof-of-principle trial, not a plan for everyone.
This is the body's default in an energy shortage. The brain runs almost entirely on glucose, and when you go without food, the small store of sugar in the liver runs low fast. Amino acids are then taken out of muscle, sent to the liver, and rebuilt into glucose to cover the gap, a step called gluconeogenesis. Muscle is also a tissue that costs a fair amount of energy to keep, and if you do not use it, the body treats it as an expense it can cut. So fat and protein get taken apart together.
This can be negotiated: eat enough protein, and give the muscle a signal it can use (strength training), and you help it stay. In one small 4-week trial, young men in a large calorie deficit who trained hard and ate a high-protein diet even gained a little lean mass. It was a proof-of-principle trial, not a plan for everyone.
Mechanism · What losing muscle costs you
First, one thing to be clear about: a good share of the weight you lose is lean mass, which includes skeletal muscle, protein in the internal organs, and water. The scale alone cannot tell you which part dropped.Cost 1 · resting metabolism slides down. Resting metabolic rate (RMR) is the energy you burn lying still all day, and muscle is one of its steady consumers. A rough estimate from the textbook value for how much a kilogram of muscle burns at rest: losing 5 kg of muscle means burning about 50–70 kcal less a day. Add adaptive thermogenesis (the body noticing a long deficit and actively cutting its spending), and the longer the diet runs, the lower the RMR. The same plate of food then moves the scale less and less.
Cost 2 · strength shrinks with it. When a muscle's cross-section gets smaller, the force it can produce usually gets smaller too. For a young person, that is a question of training performance. For an older person, it bears on getting up from a chair, climbing stairs, and whether they fall.
Cost 3 · what comes back when the weight returns. A common concern is that when weight is regained, fat tends to come back faster than muscle. After one round, the scale is back where it started, but there is more fat and less muscle than before. Repeat the cycle a few times and it may head toward sarcopenic obesity: not necessarily a high weight, but little muscle and a lot of fat, which is metabolically harder to handle than simple overweight. This point rests mainly on observation and inference and has not been settled by consistent trials, but what it asks of you is clear: protect the muscle while you lose weight.
Evidence · Can protein protect muscle in a cut?
One tightly designed controlled trial measured this directly: Longland 2016 (McMaster University, Canada; AJCN).40 young men, 4 weeks, a calorie deficit of about 40% (a severe cut, not a gentle one)Both groups did strength training plus high-intensity intervals, 6 days a weekThe groups differed only in protein: 2.4 g vs 1.2 g per kilogram of body weightResults:High-protein group: fat -4.8 kg, lean mass +1.2 kgControl group: fat -3.5 kg, lean mass +0.1 kg (essentially unchanged)Exercise performance improved about equally in both groups
How to read those lines: both groups sat in the same deficit and trained the same amount; the only difference was protein. 1.2 g/kg is already above the general adult recommendation, and under this much training it was only enough to break even. The 2.4 g/kg group not only held on but gained a little.
What it cannot tell you: 4 weeks, 40 people, young men, high-intensity training 6 days a week, and the authors themselves call it a proof-of-principle trial. It shows that losing fat and gaining muscle can happen in the same stretch of time. It does not show that an ordinary person on a gentle diet needs 2.4 g/kg every day. Nor was it done in older adults or in women.
So the line to take away is this: whether muscle stays or goes during weight loss depends on at least two things, whether protein is enough, and whether the muscle is getting the signal that it is being used.
Chapter 2
How much protein while cutting
In a fat-loss phase, protein should go up, not get cut along with calories. A common recommendation is 1.6–2.4 g per kilogram of body weight per day. Each end of that range has a source. A pooling 49 randomized trials (Morton 2018) found that in people doing regular strength training, lean mass stopped rising further once total protein passed about 1.6 g/kg. And in a large-deficit trial, the group that kept and even added muscle ate 2.4 g/kg (Longland 2016).
Why go higher in a deficit? The deficit itself suppresses the signal for building muscle, and more protein pulls that signal back up. Two side benefits come with it: protein is the most filling of the three macronutrients, and digesting it costs the most energy.
The idea that high protein damages the kidneys comes from the fact that people who already have chronic kidney disease are told to limit protein. In people with normal kidney function, there is currently no evidence that it harms the kidneys.
Why go higher in a deficit? The deficit itself suppresses the signal for building muscle, and more protein pulls that signal back up. Two side benefits come with it: protein is the most filling of the three macronutrients, and digesting it costs the most energy.
The idea that high protein damages the kidneys comes from the fact that people who already have chronic kidney disease are told to limit protein. In people with normal kidney function, there is currently no evidence that it harms the kidneys.
Numbers · Where 1.6 and 2.4 come from
The 1.6 g/kg figure is the breakpoint of a . Morton 2018 (BJSM) pooled 49 with 1863 participants, looking at what protein supplements did to muscle mass and strength over 6 weeks or more of strength training. It used a two-phase regression to find the breakpoint: once total protein passed about 1.62 g/kg, fat-free mass (lean mass) stopped rising any further. Note that the breakpoint was found for fat-free mass, not for strength, and that it is an average; individuals fall on either side of it. Eating more is not a loss; the return just stops climbing.Then why push to 2.0–2.4 g/kg during a cut? Because that curve was drawn mainly on people who trained without being short of calories. Once you are in a deficit, the same serving of protein buys a weaker synthesis response, so by that logic you need to eat more to land back at the same place on the curve:
The deficit itself suppresses muscle synthesis, and more protein pulls the signal back up (this is mechanistic reasoning; no trial has directly measured the breakpoint during a deficit)Fullness: protein is the most filling of the three macronutrients, and it makes the gut release more of the signals that say you have eaten enough (PYY, )The highest thermic effect of food (TEF): 25–30% of the calories in protein turn into heat while it is digested and processed (carbohydrate 5–10%, fat 0–3%), a built-in discountLongland 2016's high-protein group ate exactly 2.4 g/kg
How to do the math (a 70 kg body weight as the example):
1.2 g per kilogram (the Longland control group's amount): 70 × 1.2 = 84 g a day. For comparison, the US Recommended Dietary Allowance () for adults is 0.8 g/kg, which was set to prevent deficiency, not to keep muscle during a cut1.6 g per kilogram (Morton's breakpoint): 70 × 1.6 = 112 g a day2.0 g per kilogram (the middle of the fat-loss range): 70 × 2.0 = 140 g a day2.4 g per kilogram (the Longland high-protein group): 70 × 2.4 = 168 g a day
Numbers · Do older adults and athletes need more?
For people over 65, the floor is higher to begin with. The PROT-AGE consensus from an international expert group on protein in older adults gives 1.0–1.2 g per kilogram a day for healthy older adults, at least 1.2 for those who exercise regularly, and 1.2–1.5 for those with acute or chronic illness. People with severe kidney impairment who are not on dialysis are outside these tiers; their amount is set by a doctor according to kidney function.The reason is called anabolic resistance: with age, muscle builds less from the same serving of protein. Think of it as a raised threshold. In a young person, the leucine in one meal can press the switch that starts muscle building. In an older person, the same meal only touches the switch without pressing it, and that meal's chance to build is gone. This is one reason older adults need to protect muscle even more when they lose weight.
How much more older adults should eat above these tiers while losing weight has no specific figure from a dedicated trial. What can be said with confidence: keep protein at least at the matching PROT-AGE tier, give every meal a clear serving of protein, and add strength training. Anyone with chronic kidney disease should ask their doctor first.
Pregnancy and breastfeeding: you need somewhat more than usual, but pregnancy is not a fat-loss phase; the exact amount is for your obstetrician and a dietitian to set.
High-volume athletes: the sports-nutrition position statement (Thomas 2016) already recommends more protein for athletes than the general recommendation; do not cut it during a fat-loss phase.
Safety · Does high protein harm the kidneys?
Start with a trial that pushed protein extremely high. Antonio 2014 split a group of young, strength-trained men and women into two arms; the high-protein arm ate 4.4 g per kilogram of body weight a day (about 300 g a day on average) for 8 weeks. That is far above anything anyone eats day to day. Over the 8 weeks, neither group's body weight, fat mass, or fat-free mass changed noticeably. But the study measured body composition and did not measure liver or kidney markers, so it can only show that eating that much did not make people fatter. It cannot be read as evidence that eating that much does not harm the kidneys.Where the kidney worry comes from. When kidney function is already damaged, doctors do limit protein, because filtering out nitrogen waste is an extra load on injured glomeruli. Turning that around and applying it to people with healthy kidneys is like seeing someone with a broken leg on crutches and concluding that walking will snap a healthy leg. In people with normal kidney function, there is currently no evidence that a high-protein diet harms the kidneys.
So: if you have been diagnosed with chronic kidney disease, how much protein you eat is for your nephrologist and dietitian to set, and you should not raise it on your own. If your kidneys are healthy, do not push protein below 1.0 g/kg because you heard it harms the kidneys; during a cut, that makes keeping muscle harder.
Chapter 3
Why protein, of all things
Why protein, specifically? Three things stack up.
It may work one of the gates on appetite. One hypothesis holds that the body is chasing an absolute amount of protein, not a proportion. The more diluted the protein in a meal, the longer you keep eating until you have enough, and extra carbohydrate and fat come in along with it.
It presses a switch; it does not just fill a tank. Muscle does not grow in proportion to what you eat. The leucine in a meal (leucine is one of the essential amino acids) has to reach a certain amount before it presses the switch that starts muscle building, which then stays on for an hour or two. Below that amount, there is almost no response. So whether the daily total is enough is one question, and whether each meal reaches the mark is another.
Eating it costs energy in itself. Digesting and processing protein takes much more energy than carbohydrate or fat.
In a fat-loss phase, all three matter more. By the mechanism, a calorie deficit shifts muscle into a power-saving mode, and it then takes a strong enough leucine signal to turn building back on.
It may work one of the gates on appetite. One hypothesis holds that the body is chasing an absolute amount of protein, not a proportion. The more diluted the protein in a meal, the longer you keep eating until you have enough, and extra carbohydrate and fat come in along with it.
It presses a switch; it does not just fill a tank. Muscle does not grow in proportion to what you eat. The leucine in a meal (leucine is one of the essential amino acids) has to reach a certain amount before it presses the switch that starts muscle building, which then stays on for an hour or two. Below that amount, there is almost no response. So whether the daily total is enough is one question, and whether each meal reaches the mark is another.
Eating it costs energy in itself. Digesting and processing protein takes much more energy than carbohydrate or fat.
In a fat-loss phase, all three matter more. By the mechanism, a calorie deficit shifts muscle into a power-saving mode, and it then takes a strong enough leucine signal to turn building back on.
Mechanism · What the protein leverage idea says
The protein leverage hypothesis, proposed by Simpson and Raubenheimer, says that the body's need for protein is an absolute amount, not a proportion. If the protein in the diet is diluted, the body eats more total calories until protein is met, even if that means hundreds of extra calories of carbohydrate and fat. It has been used to explain part of modern obesity: many processed foods are low in protein density, so people passively eat more. It is still a hypothesis, not an established main cause.Used in reverse: raise the share of protein in meals, and appetite may close on its own. One often-cited study is Weigle 2005 (AJCN). It was not a . The same participants went through phases one after another, with no control group: first 15% of calories from protein, then 30% (with the carbohydrate share unchanged), and finally 30% protein eaten freely. In the free-eating phase, they spontaneously ate about 441 kcal less per day. The direction is clear, but with few participants and no control group, it counts only as a supporting clue.
What it looks like on your table: a cookie loaded with sugar and oil, or a cup of milk tea, is very low in protein density. Plenty of calories are already in, but the body's protein ledger is still unpaid, so a while later you want something else to eat. Swap the same calories for eggs, yogurt, or tofu, and the ledger closes sooner; the next round of snacking may not come.
weigle-2005-high-protein-appetite
Mechanism · How leucine switches on synthesis
Muscle protein synthesis (MPS, the process by which muscle strings amino acids into new protein) is not eat and it builds. It works more like a switch with a threshold:A common working figure is that a meal needs about 2.5–3 g of leucine (roughly 25–30 g of high-quality protein, or 0.3–0.4 g per kilogram of body weight) to turn on , the master regulator of synthesis, which then runs for about 90–120 minutes. These figures come mainly from short-term metabolic studies that measured the rate of synthesis, not muscle mass months laterBelow the threshold, synthesis barely responds. In older adults, anabolic resistance raises the threshold, to about 0.4 g per kilogram per meal in the short-term studiesHow to split it: Areta 2013 had people who had just done strength training eat 80 g of whey protein over 12 hours. 20 g every 3 hours, in 4 servings, produced more myofibrillar protein synthesis than 8 servings of 10 g or 2 servings of 40 g. It did not measure leucine in grams, so do not count the 2.5–3 g leucine threshold above as that paper's finding
What the switch looks like inside the cell: once leucine enters a muscle cell, a sensor inside the cell recognizes it and it docks there. When the sensor is occupied, it lets mTORC1 through, and mTORC1 starts the translation machinery on the ribosome side, joining amino acids from the blood one by one into new muscle-fiber protein. Leucine here is more a key than a brick: the bricks are all the amino acids in that meal, but if the key is not in place, the door does not open.
The key implication: a sufficient daily total is not the whole story; ideally every meal clears the threshold. A breakfast with 5 g of protein plus a dinner with 100 g, versus three meals of 35 g each: the daily totals are about the same, but by this mechanism the results are not.
Mechanism · Why digesting protein costs energy
The thermic effect of food (TEF) is the share of the calories you eat that turns into heat while the food is digested, absorbed, and processed. Rough textbook proportions:Protein: 25–30% (of 100 kcal of protein, about 25–30 kcal is given off as heat and 70–75 kcal is kept)Carbohydrate: 5–10%Fat: 0–3%
By those proportions, swapping 100 kcal of carbohydrate for 100 kcal of protein burns about 20 extra kcal a day. A day with 150 g of protein compared with a day with 80 g (same total calories, with the difference made up by carbohydrate) differs in thermic effect by about 40–70 kcal. The number is small, but it points the same way as fullness: high protein means the same calories, a little less kept, and more satisfied.
Where that energy goes: amino acids cannot be stored in a lump the way fat can; the body has no amino-acid warehouse. Whatever you eat and cannot use right away first has its nitrogen stripped off in the liver and made into urea for the kidneys to excrete. Only then is the remaining carbon skeleton burned for energy or turned into other molecules. That whole take-apart process itself burns (the energy currency cells use), and what radiates out is the slight warmth you feel after a high-protein meal.
Chapter 4
Spreading it across the day
The core rule: 0.3–0.4 g per kilogram of body weight per meal, which is 25–40 g of high-quality protein; 3–4 meals a day, 3–5 hours apart. These figures come from short-term studies of muscle synthesis. They are working figures, not a precise prescription.
The meal after you wake up matters most. After a night without food, muscle is in a state of net breakdown: liver glycogen and amino acids in the blood are both low, and the body is repairing in one place by borrowing from another. Put protein into the first meal and building starts up again. Skip breakfast and push the first real protein to the afternoon, and that stretch of net breakdown runs half a day longer.
The most common mistake is not eating too little but eating too lopsided: a slice of bread in the morning, a make-do lunch, a big plate of meat at night. The daily total looks on target, but only the evening meal crossed the threshold, and for most of the day the switch that starts muscle building was never pressed.
The meal after you wake up matters most. After a night without food, muscle is in a state of net breakdown: liver glycogen and amino acids in the blood are both low, and the body is repairing in one place by borrowing from another. Put protein into the first meal and building starts up again. Skip breakfast and push the first real protein to the afternoon, and that stretch of net breakdown runs half a day longer.
The most common mistake is not eating too little but eating too lopsided: a slice of bread in the morning, a make-do lunch, a big plate of meat at night. The daily total looks on target, but only the evening meal crossed the threshold, and for most of the day the switch that starts muscle building was never pressed.
In practice · Laying out a day of protein
What one day can look like (70 kg body weight, target 140 g a day):Breakfast 35 g: 2 whole eggs (12 g) + 200 g Greek yogurt (20 g) + a small handful of nuts (3 g)Lunch 40 g: 150 g chicken breast or fish (35 g) + 100 g chickpeas (7 g)Snack 25 g (after training): a serving of whey with 25 g of protein, or 200 g low-fat cottage cheeseDinner 40 g: 150 g beef, salmon, or tofu (30 g) + a side dish with legumes (10 g)
30 g of protein after waking matters most:
After an overnight fast, muscle is in a net-breakdown state (liver glycogen and amino acids in the blood are both low)Protein at the first meal starts building again and ends that breakdown earlierSkip breakfast and push the first meal to the afternoon, and net breakdown runs 4–6 hours longerThe pattern to avoid: a carbohydrate breakfast, a make-do lunch, and all the protein at dinner, so that synthesis does not respond for most of the day
How to use this table: do not copy the numbers; copy the shape. Every meal has a clear protein lead (eggs, dairy, meat, fish, or soy foods; pick one), rather than a daily total scraped together from the scattered protein in staples and vegetables. Put in your own body weight and redo the math with the per-meal rule.
In practice · Timing around training, and sources
Eating around training:There is no 30-minute window you must catch after training. The practical advice in Aragon and Schoenfeld's 2013 review is that the meals before and after training should be no more than about 3–4 hours apart, and that the day's total protein matters more than timingProtein eaten after training produces a stronger synthesis response than either training alone or eating alone; a common serving is 20–40 gIn practice: eat a full meal within 1 hour of finishing, or have a serving of whey first and a full meal 1 hour later
High-quality protein sources (ordered by leucine content and how fast they are absorbed):
Whey: about 11% of its protein is leucine; it is absorbed fastest and is a common post-training choice. 25 g of whey protein contains about 2.7 g of leucine, right around the threshold people usually citeEggs: about 8.5% of whole-egg protein is leucine; all the essential amino acids are there, plus choline and vitamin D; a good breakfast choiceFish (salmon, tuna, cod): high in protein, and fatty fish also bring omega-3Lean red meat (beef, pork loin): iron, B12, and creatine on top of protein; 2–3 times a weekGreek yogurt and cottage cheese: mainly casein, which digests slowly; often placed in the meal before bedSoy foods (tofu, edamame, soy protein): one of the few plant sources close to animal protein in quality, with about 8% leucine
Vegetarian and vegan: check that the amino acids add up:
A single plant protein is usually short of one limiting amino acid (the one that runs out first): grains (rice, wheat) are low in lysine, and legumes are low in methioninePair grains with legumes (rice and beans, flatbread and hummus, whole-wheat bread and peanut butter) to fill the gaps; covering them over the day is enough, and each meal does not have to be matchedSoy, quinoa, and amaranth are among the few plant proteins that are fairly complete on their ownPlant proteins generally score lower than animal proteins on DIAAS (the Digestible Indispensable Amino Acid Score), so vegetarians do well to aim a little higher, or to top up with protein powderWhen needed, soy, pea, or rice protein powder is a basic tool, not a luxury
Background · Where to read next
This story covers protein during a fat-loss phase only. The stories most closely connected to it:The overall framework for a fat-loss phase is in Weight ManagementWhy resting metabolism drifts down along with the weight is in Adaptive ThermogenesisWhere the signals that make you hungrier as you lose come from is in Leptin Resistance & Body-Weight Set-PointProtein itself (essential amino acids, quality scores, the basic daily amount) is in protein; how protein and strength training work together is in Protein + liftingHow leucine presses the muscle-building switch, step by step, is drawn out in the mechanism diagram of this story's chapter on why protein, of all things
References · 9
- Hall, K. D., Bemis, T., Brychta, R., Chen, K. Y., Courville, A., Crayner, E. J., Goodwin, S., Guo, J., Howard, L., Knuth, N. D., Miller, B. V., Prado, C. M., Siervo, M., Skarulis, M. C., Walter, M., Walter, P. J., & Yannai, L. (2015). Calorie for calorie, dietary fat restriction results in more body fat loss than carbohydrate restriction in people with obesity. Cell Metabolism, 22(3), 427–436. 19 adults with obesity in a metabolic ward, each receiving both isocaloric diets for 6 days in random order after a 5-day baseline: cutting carbohydrate raised fat oxidation and lost 53 ± 6 g/day of body fat; cutting fat left fat oxidation unchanged but lost 89 ± 6 g/day (P = 0.002). Model simulations predicted the body minimises such differences over longer periods (abstract, PMID 26278052). 10.1016/j.cmet.2015.07.021
- Longland, T. M., Oikawa, S. Y., Mitchell, C. J., Devries, M. C., & Phillips, S. M. (2016). Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: A randomized trial. American Journal of Clinical Nutrition, 103(3), 738–746. 40 young men (20 per group), 4 weeks at a ~40% energy deficit with resistance training plus high-intensity intervals 6 days a week; 2.4 vs 1.2 g protein/kg/day. Lean body mass +1.2 ± 1.0 kg vs +0.1 ± 1.0 kg; fat mass -4.8 vs -3.5 kg; exercise performance improved similarly in both groups. The authors call it a proof-of-principle trial (abstract, PMID 26817506). 10.3945/ajcn.115.119339
- Morton, R. W., et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), 376–384. 49 RCTs, 1,863 participants, resistance training of 6 weeks or more. Protein supplementation added 2.49 kg to 1RM and 0.30 kg to fat-free mass; the effect fell with age and was larger in trained people. Break point for FFM gains at 1.62 g/kg/day (95% CI 1.03-2.20; 42 study arms, 723 participants; the biphasic model was not statistically significant, p = 0.079); given the CI, the authors say ~2.2 g/kg/day may be prudent for those maximising gains; timing, post-exercise dose and source play a minor if any role; they cite per-dose MPS break points of 0.24 (younger) and 0.40 g/kg (older). One author reports grant support from the US National Dairy Council (abstract and full text, PMC5867436). 10.1136/bjsports-2017-097608
- Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). American College of Sports Medicine joint position statement: nutrition and athletic performance. Medicine & Science in Sports & Exercise, 48(3), 543–568. The abstract has no g/kg numbers. Full text: protein intake to support metabolic adaptation, repair, remodelling and protein turnover generally ranges from 1.2 to 2.0 g/kg/day, with higher intakes for short periods of intensified training or reduced energy intake; about 0.3 g/kg after key sessions and every 3-5 hours over multiple meals (full text, MSSE page via Wayback snapshot 7 March 2026). 10.1249/MSS.0000000000000852
- Antonio, J., Peacock, C. A., Ellerbroek, A., Fromhoff, B., & Silver, T. (2014). The effects of consuming a high protein diet (4.4 g/kg/d) on body composition in resistance-trained individuals. Journal of the International Society of Sports Nutrition, 11, 19. 30 resistance-trained men and women randomised to their usual diet or 4.4 g/kg/day protein for 8 weeks: the high-protein group ate 307 +/- 69 g/day (4.4 g/kg) vs 138 +/- 42 g (1.8 g/kg) and more calories, with no change in body weight, fat mass, fat-free mass or percent fat. Body composition only (abstract, PMID 24834017). 10.1186/1550-2783-11-19
- Bauer, J., Biolo, G., Cederholm, T., Cesari, M., Cruz-Jentoft, A. J., Morley, J. E., et al. (2013). Evidence-based recommendations for optimal dietary protein intake in older people: PROT-AGE Study Group. JAMDA, 14(8), 542-559. 10.1016/j.jamda.2013.05.021
- Areta, J. L., Burke, L. M., Ross, M. L., Camera, D. M., West, D. W. D., Broad, E. M., et al. (2013). Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis. Journal of Physiology, 591(9), 2319-2331. With 80 g protein over 12 h, 4×20 g every 3 h maximized myofibrillar protein synthesis vs 8×10 g/1.5 h and 2×40 g/6 h. 24 healthy trained men, 3 groups of 8, each given 80 g whey over 12 h after resistance exercise (8 x 10 g every 1.5 h, 4 x 20 g every 3 h, 2 x 40 g every 6 h). All raised myofibrillar protein synthesis 88-148% above rest; the 4 x 20 g pattern exceeded the other two by 31-48% (abstract, PMID 23459753). 10.1113/jphysiol.2012.244897
- Simpson, S. J., & Raubenheimer, D. (2005). Obesity: the protein leverage hypothesis. Obesity Reviews, 6(2), 133-142. Protein leverage hypothesis: humans prioritize protein intake; when food is low in protein density, total caloric intake increases to meet protein target, driving passive overconsumption. 10.1111/j.1467-789X.2005.00178.x
- Aragon, A. A., & Schoenfeld, B. J. (2013). Nutrient timing revisited: Is there a post-exercise anabolic window? Journal of the International Society of Sports Nutrition, 10(1), 5. Practical recommendation: pre- and post-exercise meals should not be separated by more than about 3-4 hours; an urgent 30-minute window is not supported. Daily protein total dominates timing. 10.1186/1550-2783-10-5