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regulates · 4
↔Leptin Resistance / Set-point
The idea that being heavy means a slow metabolism gets it backward: more body tissue takes more energy to maintain, and at the same height a heavier person usually has a higher resting metabolism. The genuinely slow stretch comes after weight loss; it is a consequence of losing weight, not the cause of gaining it.
Obesity genuinely lowers testosterone: the aromatase enzyme in fat tissue converts testosterone into estrogen. The more weight comes off, the more testosterone usually recovers, so weight loss is the highest-return step here, ahead of any supplement; in a 12-week trial, D-aspartic acid did not raise testosterone at all.
Weight loss sets off a defense that pulls weight back up: in one study, appetite-related hormones had still not returned to their earlier levels a year after the weight came off. Strength training plus enough protein decides how much of the lost weight is muscle, and keeping muscle means resting metabolism falls less.
A preference for fatty, sugary food comes partly from inborn differences in reward sensitivity and partly from learning through repeated exposure. Most genes linked to obesity act on appetite control in the brain, and ultra-processed foods tend to stimulate this reward circuit the hardest.