or better yet, they don't even snack, but the condiments they use with their healthy foods and amounts of those condiments they use - end up putting them into major surplus. don't even have to be unhealthy condiments. pour on some good olive oil into your salad, into your saute pen, dip your celery stick into peanut butter a little too generously, eat second serving of granola and/or some nuts etc etc and bam - you just ate more then you realized.
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oh certainly (and part of the reason he can go that high is because he is extremely active and built up enough muscle mass to need those calories.)
as for calories and their differences. (this is reply to a different post, sorry)
thermic effect (meaning how many of ingested calories go into digesting of those calories) of protein is between 15 and 30%. thermic effect of carbs is about 10 to 15% thermic effect of fat is under 5%. but even for protein, its a relatively small portion of the calories you ingest.
and here is the problem with processed foods. its not that their calories get digested differently. its that our brain processes eating them differently. they don't give us that feeling of satiety, and instead trigger our brain to eat more. so you end up eating more. a calorie is still a calorie. as per above, a lot of times people simply don't realize just how MANY calories they consume, and its especially easy to lose track of with highly processed, highly tasty snacks.
another thing a lot of people do not know how to do is READ THE LABELS. servings in US especially are arbitrary. and servings on the label are much smaller then people realize, unless they specifically measure/weight them out. and that's why losing weight becomes so difficult for so many people. not because laws of thermodynamics work differently with processed foods.
and to reiterate SIMPLE concept =/= EASY execution.