Ultra-processed Foods (UPF)

超加工食品 · Ultra-processed Foods

Place · Level 3 · Macro

NOVA 分级 · Hall 2019 NIH RCT 同卡路里 +500 kcal/d · 超 60% 美国人热量 · 营养学最重要的范式转移

Connected to · 3

synergy · 1

Sweeteners
UPF 'zero-sugar' reformulations are the main delivery vehicle for aspartame / sucralose / erythritol. Hall 2019 RCT + WHO 2023 both show: cutting sugar ≠ cutting total intake — UPF whole-design is the lever.

antagonism · 1

Carbs & Fiber
UPF strips the food matrix → near-zero fiber → high energy density (Hall 2019: 2.06 vs 1.20 kcal/g) → +500 kcal/day. Fiber loss IS the UPF harm mechanism, not a side note.

regulates · 1

Fructose Metabolism
HFCS is the industrial-fructose vector; UPF sweetened beverages are the #1 fructose delivery system globally. The issue isn't fructose-in-isolation — it's UPF's fast-liquid-high-density delivery.

NOVA 4-tier classification

Stop 1/5

NOVA 4 类分级

The NOVA food classification is a framework proposed by Monteiro's team at the University of São Paulo (Brazil) in 2009, now adopted by WHO, FAO, the EU, and Canadian dietary guidelines. It classifies food by processing degree, not by macro or calorie:

Tier 1 · unprocessed or minimally processed:

Whole fruit, vegetables, whole grains, legumes, nuts, meat, eggs, fish, dairy (no additions)Processing only for preservation or convenience (frozen, dried, vacuumed, cut)Examples: apple, spinach, brown rice, chicken breast, plain yogurt, raw eggs
Tier 2 · culinary ingredients:

Substances extracted from Tier 1 — sugar, oil, salt, starch, butterNot meant to be eaten alone, but cooking inputsExamples: olive oil, sugar, sea salt, flour, butter, vinegar
Tier 3 · processed foods:

Simple combinations of Tier 1 + Tier 2, usually 2–3 ingredientsTraditional preservation / cooking methods (fermentation, smoking, curing, baking)Examples: canned tomatoes, traditional bread (flour + water + yeast + salt), cheese, salted fish, smoked meat, homemade jam
Tier 4 · ultra-processed foods (UPF):

5+ ingredients, usually containing things you don't have in a home kitchen:Industrial sugars (high-fructose corn syrup HFCS / invert sugar)Industrial fats (hydrogenated oil / refined palm oil / trans fats)Industrial proteins (soy isolate / hydrolyzed wheat protein)Flavorings (MSG + 5'-inosinate + various 'natural flavors')Emulsifiers (polysorbate 80 / carrageenan / xanthan gum / mono- and diglycerides)Thickeners, preservatives, artificial colors, artificial sweetenersProduced by industrial extrusion / high-temperature pressure / chemical modificationDesign goal: hyper-palatable + long shelf life + ready-to-eatExamples: soft drinks, instant noodles, breakfast cereals, packaged pastries, sausages, chicken nuggets, ice cream, candy, frozen meals, most bag snacks, chain bakery breads (with 10+ additives)
Quick identification rules:

If the ingredient list contains 'emulsifier / thickener / flavor enhancer / artificial sweetener / maltodextrin / high-fructose syrup' → UPFIf a home kitchen can't make it from these ingredients, it's UPFIf the ingredient list has 5+ items, most are UPF (with rare exceptions: complex homemade sauces can have 5+ items too)
Why not classify by macros:

The same 200 kcal of chicken breast vs a 'protein bar' produces completely different metabolic effects in the body (next scene's Hall RCT proves this)Calorie accounting cannot explain UPF's health harm → a new framework is needed

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Educational content, not medical advice — consult a clinician.

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