I have an unfounded belief that people do not actually use up most of the calories they eat, they are excreted. Everyone, including both normal-weight ("thin") and obese people eats ingests more calories than is needed by the body given the sedentary lifestyles in modern society, yet some do not gain weight as quickly. Additionally, given how efficient human bodies are, meaning how much work you have to do to burn an apple's worth of calories, it is impossible to suggest that everyone of normal weight burns all excess calories.

I have a well founded belief that obesity cause is sugar and its close relatives. There's no mistery about that. Obesity is almost unknown before sugar is introduced in a country's diet.

Current epidemic is caused because sugar is not only available but practically unavoidable if you consume prepackaged food. It's added to all kinds of food, some of them, like mayo, bread or sausages, totally superfluous. Meanwhile some "experts" keep talking about dietary fat and calories.