[Mr Rogers]

“then they’re claiming that the First Law of Thermodynamics is no longer valid.”

The First Law of Thermodynamics involves a closed system. Your body is not a closed system. Stuff comes in and goes out.

Also, thermodynamics has nothing to do with hunger or cravings, which in turn drive how much we eat. And what.

Humans are not automobiles.

[BobL]

” Your body is not a closed system. Stuff comes in and goes out.”

I was going to note that my anus still works, but didn’t want to be rude.

What he says really only applies to fasting - when you’re essentially a closed system.

[Mase]

The First Law of Thermodynamics says you can't get something from nothing. The diet charlatans want you to believe that there are all sorts of complex components to losing weight other than the simple explanation of eat less energy than you burn and you will lose weight. That very simple and accurate advice works but, unfortunately, it doesn't sell diet books, diet plans or diet food.

Yes, this is advice for people with healthy bodies. Those suffering from other maladies will have other challenges to overcome to lose weight. However, that represents a minuscule percentage of the population. For the vast majority of people, losing weight, and gaining the benefits from doing so, is simply a matter of calories in vs. calories out.