Evidence-based nutrition

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The Definitive Guide

Carbs and body composition: everything the evidence actually says

The evidence points to the carb level being the least important variable in the stack. Four research programs proved the macro split doesn't drive fat loss. What actually matters is how fast food disappears from your plate — not what's in it.

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Myths we killed 4

Cutting carbs is required for fat loss

Carbs trap you in a hunger loop through insulin

Sugar is uniquely fattening through a special pathway

The 'metabolic advantage' of low-carb burns significantly more calories

10 studies 4 RCTs 5 meta-analyses Triple-verified Explore cluster →

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What the evidence says

How Many Carbs Per Day to Lose Fat? What 5,192 Participants Revealed Scientists have tested this from every angle — large free-living trials, calorie-matched comparisons, and locked-ward feeding studies where every bite was measured. The answer is consistent: your body… 2:55 · 4 studies

Is sugar — and fructose specifically — uniquely fattening compared to other carbs? When scientists swapped sugar for other carbohydrates at the same calories across twelve controlled trials, body weight barely moved — 0.04 kg, roughly the weight of a yogurt… 3:54 · 4 studies

Does Glycemic Index Matter for Fat Loss? 14 Trials, One Answer Fourteen trials tracked overweight adults eating low-GI versus high-GI carbs for six months or longer. The weight difference was 0.62 kg — too small and uncertain to register… 3:27 · 5 studies

Does Fiber Accelerate Fat Loss? What 62 Pooled Trials Found Adding viscous fiber like psyllium to your regular diet nudges body weight down without calorie counting — about a third of a kilogram across all the evidence, but… 3:29 · 3 studies

Do Carbs Trigger an Insulin-Driven Hunger Loop? The popular idea is that eating carbs spikes your insulin, which makes you hungrier, which makes you overeat — a self-reinforcing loop. Two controlled studies tested this directly.… 3:33 · 2 studies

How Many Carbs Per Day to Build Muscle? Researchers pooled the 11 controlled trials their search found on carbs and muscle growth. Across about 227 participants, eating more carbs added no significant muscle compared to eating… 3:03 · 4 studies

Do You Have to Cut Carbs to Lose Fat? Researchers have tested low-carb against balanced diets in thousands of people, controlling for calories, tracking for up to two years, and even spending $8.2 million looking for a… 3:29 · 4 studies

Are Ultra-Processed Foods Making You Gain Weight? When scientists gave the same people two diets matched for the main nutrients on the label — same calories offered, same fat, same sugar, same fiber — people… 3:24 · 4 studies

Does Carb Timing Actually Matter? What 4 Analyses Found Three of four analyses — a 19-author position stand, and a review and a meta-analysis co-written by two of its authors — rank what you eat across the… 3:25 · 4 studies

Will Keto Wreck Your Strength? What 6 Trials Actually Found Researchers pooled six trials where trained lifters went keto while training for 8-12 weeks. Max strength on squat and bench ended up in the same place as lifters… 3:07 · 4 studies

Does Cutting Carbs Burn More Calories? What 2 Studies Actually Found Two respected research teams disagree sharply on whether eating fewer carbs makes your body burn more calories. One team (Ebbeling, Ludwig) found that people who recently lost weight… 3:40 · 2 studies

The papers we actually read

Do You Need Carbs to Build Muscle? <em>What 11 Studies Actually Found</em> This meta-analysis pooled 11 randomized controlled trials and found no significant effect of carbohydrate intake on muscle growth during resistance… Henselmans et al. · 2026 · Sports Medicine · n=227

Low-GI Diets and Weight Loss: What 14 Trials Actually Bought You Fourteen pooled trials found that low-GI diets produced a non-significant 0.62 kg weight difference over six or more months, while… L et al. · 2013 · Nutrition, Metabolism and Cardiovascular Diseases · n=2,344

The 24-Hour Window The ISSN's 19-author consensus found that total daily protein and carbohydrate intake is a higher priority than nutrient timing for… Kerksick et al. · 2017 · Journal of the International Society of Sports Nutrition

Psyllium vs Glucomannan: What 62 Trials Found Psyllium husk reduced body weight by 0.89 kg (statistically reliable). The konjac-based glucomannan blend managed 0.41 kg (not reliable enough… 2:43 · Jovanovski et al. · 2020 · The American Journal of Clinical Nutrition · n=3,877

Keto and Strength: 6 Trials Pooled, Here’s What Moved Six randomized controlled trials pooled 131 trained lifters on keto versus normal diets over 8-12 weeks and found no significant… Vargas-Molina et al. · 2024 · Nutrients · n=131

Does Sugar Cause Weight Gain? What 30 Trials Actually Show Across 12 controlled trials, swapping sugar for other carbohydrates at the same calories changed body weight by 0.04 kg —… 3:36 · Morenga et al. · 2013 · BMJ

Ebbeling 2018: 278 Extra Calories on Low-Carb (and Why It’s Disputed) After weight loss, the low-carb group burned 278 extra calories per day — an effect 3.6 times bigger in people… 3:40 · Ebbeling et al. · 2018 · The BMJ · n=164

Hall 2021: Keto vs Plant-Based — Who Actually Ate More? In twenty adults locked in a metabolic ward, the keto diet produced 689 extra calories per day with identical hunger… 2:38 · Hall et al. · 2021 · Nature Medicine · n=20

Hall 2019 UPF Study: 508 Hidden Calories Nobody Tasted Twenty adults locked in an NIH hospital ward ate 508 extra calories per day on ultra-processed food — despite rating… 3:18 · Hall et al. · 2019 · Cell Metabolism · n=20

Low Carb vs Low Fat: What 609 Dieters Found After 12 Months In 609 adults followed for 12 months, the difference between healthy low-carb and healthy low-fat was just 0.7 kg —… Gardner et al. · 2018 · JAMA · n=609

Nutrition

A fuller tank and a faster race are two separate promises, and for women only the first has been shown.

Carb Loading and Women: The Old ‘No’ Came From the Plate

4 min read 843 words

Nutrition

Keeping people regular was the job fiber was famous for. It belonged to bran cereal and a grandparent's advice at breakfast, a virtue so plain that nobody ever bragged about it. Lately it has been promoted. Metabolism-boosting food lists and wellness blogs now credit fiber with making the body burn extra calories just to break it down, a free bonus for anyone already piling on beans and whole grains to stay full. You would want to know whether fiber increases metabolism before counting on it.

Fiber Barely Touches Your Metabolism. Its Calories Go Somewhere Else.

4 min read 868 words

Nutrition

The 90-minute line measures time on your feet, not the name printed on your race bib.

Carb Loading for a Half Marathon: Top Up, Load, and Why Your Finish Time Matters

6 min read 1203 words

BUILT TO PROVE OURSELVES WRONG

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Explore full Carbs cluster

About FitChef

No opinions. Just the science.

We go through hundreds of studies so you don't have to. Then we turn them into stories anyone can understand — and listen to on the go.

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The research

10 peer-reviewed studies

4 RCTs

11 claims verified

Triple-verified · DOI-linked · Kill-switched

In numbers

23stories

154claims

134studies reviewed

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