I am going to say something about this topic since I have study some of obesity issues. I agree with TonyW. I really do not care about what you eat. The bottom line is if you put in more than you burn, you will gain few extra pounds. Human body design is about the same as few thousand years ago. Therefore, your body burn energy intake in this order: Carb. Proteins, and Fat. All diets are manipulation of this system. For example, low carb diet, it basically takes out carb of your intake. In this case, your body have to burn protein, then fat.
First, what does extra pound mean? In this world, you will obey the law of physics wether you like it or not. It means it does cost more fuel to make takeoff. Try to think about 100 people average weight about 180 lbs vs. 100 people who average weigh about 250 lbs. That is a 7000 lbs difference. I believe airplane can achieve Vr a little quicker.
Second, if you have heart attack, knee replacement surgery, or high blood pressure because of your weight, how much money do you think overall the medical cost on you alone? I promise you will not pay all of it. I can give you a figure from my previous job experience. When you walk into E.R, before doc even look at you and not riding ambulance, that is a 50 ~ 80 dollars registration fee. X ray is about 100 dollars. What about open heart surgery? Who pick the rest of your bill?
My suggestion is to check and write down your diet. Go ahead, write down what you have for the next week. You will be surprised. For JCers, if my memory serve me correct, high blood pressure can ground you in a heart beat.
adreamer