I get what you are saying RobertJohnson about calories vs hunger, but the problem is that in the game they are too disconnected. Calories should correlate with hunger by at least 50%, but at the moment it feels that they are completely disconnected. I think this could be solved by adjusting the calorific quantities for many items. 720 (said earlier in the thread) is far too much for a packet of chips (as is -15 hunger reduction... I am usually hungrier after eating chips than before!). On the other some vegetables might be too low such as potatoes or carrots - both are tubers whose purpose is to store a bunch of energy.
I am not sure if it is done already or too difficult, but exercise should be reflected in both hunger and expended calories.
Also, in a related way - hunger and/ or the quantity that you can eat should reduce when nauseous