Exercise often produces the opposite of intended results due to hormonal effects.

Nutritionists have for decades been reducing weight gain or loss to a calorie count. They say weight increase equals calories consumed minus calories burned up.

Superficially, it would appear that they have to be correct. It's the assumptions that go with it, and sometimes the next statement, that are in error.

They then say that losing weight requires fewer calories consumed, or more exercise, or both. That aint what happens.

Persons who do hard work, particularly if it's sporadic, notice that weight increase goes with increased exercise. Idiots would say that's because they eat more. No kidding. Are they supposed to eat less?

Fat production, like everything else in the body, is under numerous, complex, physiological controls. Evolution caused fat production to increase when getting increased exercise, because more energy reserves are needed.

If a person would eat less while getting more exercise, and while the body is trying to increase fat production through hormonal control, the first problem is that it might be dangerous to health; and the second problem is that no one is going to do it.

If eating less was the way people wanted to lose weight, they wouldn't have to exercise to do it. They are looking for an easier way. Stimulating hormones and then fighting hormones is not an easier way to do it.