Differential equations are a bugger. You get four of them, one for each mechanism group trying to adjust your weight up or down by changing intake or expenditur

Differential equations are a bugger. You get four of them, one for each mechanism group trying to adjust your weight up or down by changing intake or expenditure. Some are physiological, some psychological. If they get out of whack, you get weight gains or losses. But this is non-trivial non-linear stuff that’s pretty much impossible to keep track of even if you have the right memtal models.