Lobster Thermidor has 800 calories in my game too, I was mistaken in my example.



I did do a test on the calorie/weight thing and looks like the 100 calories per 1 pound of weight is accurate. What I did was set Lobster Thermidor to 10,000 calories, which should be 100 pounds on the scale (10,000 calories/100). In game I drank an Insta-Lean potion which set my FAT_STATE to -100, I could see my ribs, spine, muscle definition, etc. I then ate a serving of Lobster Thermidor and my weight jumped up to a point where I was still thin but muscle definition was smoother and ribs and spine were no longer visible (FAT_STATE 0). After eating a second serving of Lobster Thermidor my Sim became huge, as if he had just drank a Insta-Large potion (FAT_STATE 100).



So it looks like Sim weight ranges from 0 to 200 (100 is normal) and for every 100 calories you consume your Sim will gain 1 pound on this scale. I haven't looked into what the calorie burn rate is for exercising.