In 1999, scientists at the Mayo Clinic made 16 people eat 1,000 extra calories a day for 8 weeks. Some gained almost 7 kilos. One gained about 1. Same extra food, same 8 weeks. The rest was burned off by fidgeting, standing and walking around, without them noticing.
If you’re a skinny guy who eats a lot and still can’t gain weight, your body isn’t broken. It’s just very good at staying the same. In this video:
• the meal-count test (comment your number!)
• why you’re not gaining: lean mass, everyday movement (NEAT), appetite and genes (the twin study)
• the good news: every twin gained, and thin people gain mostly lean tissue
• the proof: what decides if the extra weight is muscle or fat
• 4 rules: eat on a clock, drink some of your calories, protein in every meal, give the food a job
• 4 weeks you can copy, 3 mistakes to skip, what to expect, and 4 questions everyone asks
Chapters
0:00 The overfeeding study: 1,000 extra calories a day
0:42 The meal-count test
0:57 Why you’re not gaining (it’s not your metabolism)
2:00 The good news
2:25 The proof: protein decides
2:58 Rule 1: eat on a clock, not on hunger
3:39 Rule 2: drink some of your calories
4:31 Rule 3: protein in every meal
4:57 Rule 4: give the food a job
5:21 4 weeks you can copy
6:02 3 mistakes to skip
6:23 What to expect
6:56 4 questions
7:27 Your test result
7:56 You can choose what’s on your plate
Sources
• Levine JA, Eberhardt NL, Jensen MD (1999). Role of nonexercise activity thermogenesis in resistance to fat gain in humans. Science, 283(5399), 212–214.
• Bouchard C, Tremblay A, Després JP, et al. (1990). The response to long-term overfeeding in identical twins. New England Journal of Medicine, 322(21), 1477–1482.
• Johnstone AM, Murison SD, Duncan JS, Rance KA, Speakman JR (2005). Factors influencing variation in basal metabolic rate include fat-free mass, fat mass, age, and circulating thyroxine but not sex, circulating leptin, or triiodothyronine. American Journal of Clinical Nutrition, 82(5), 941–948.
• Forbes GB (2000). Body fat content influences the body composition response to nutrition and exercise. Annals of the New York Academy of Sciences, 904, 359–365.
• Bray GA, Smith SR, de Jonge L, et al. (2012). Effect of dietary protein content on weight gain, energy expenditure, and body composition during overeating: a randomized controlled trial. JAMA, 307(1), 47–55.
• DiMeglio DP, Mattes RD (2000). Liquid versus solid carbohydrate: effects on food intake and body weight. International Journal of Obesity, 24(6), 794–800.
• Iraki J, Fitschen P, Espinar S, Helms E (2019). Nutrition recommendations for bodybuilders in the off-season: a narrative review. Sports, 7(7), 154.
• The shake: ½ liter of whole milk ≈ 305 kcal, a banana ≈ 105, 50 g of oats ≈ 195, 2 tablespoons of peanut butter ≈ 190 (standard food tables, USDA FoodData Central).
The meal-count levels are our own rough guide, not a medical test. This video is general education, not medical or nutrition advice: if you’ve been losing weight without trying, or you have a medical condition, talk to a doctor first.
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