Refined Carbohydrates such as High Fructose Corn Syrup and refined sugars (Found commonly in American-made soft and fruit drinks) should definitely be avoided, or at least minimized. I don't know of any dietitians that would say otherwise.
There is certainly merit in the input to ouput ratio when it comes to energy (food). It is surprising to many people that some of the most fit people (Olympic athletes, and Infantrymen
) actually consume more food than the average American, period. This is to a scale or ratio. This is entirely due to the fact that you require more energy when your activity level increases. You will also notice that healthier individuals seek a more balanced diet.
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This isn't to say that our bodies aren't individualized. I for one eat a much larger ratio of meat when compared to my diet than most people. I have been told this isn't healthy, but I have an innate craving for the larger supplement of meat. This also hasn't affected my ability to perform in my tasks here in Afghanistan as an Infantry Medic.
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The best solution I can provide for obesity is a balanced diet, and a strict exercise regimen. I have personally seen individuals 40+lbs overweight go through Basic and AIT coming out having come down 20+lbs. I would say anyone that argues against a balanced diet and exercise is probably trying to sell you something, or rationalizing complacency.
Just my two cents.