Maggie's Farm

This is really much easier than they are making it. You need your MDR's and if you work a physical job you need more calories than someone who doesn't. Unless you have a disease that requires a specific diet or an allergy of some type you can pretty much eat what you want to. Almost everything else is personal bias.

Your diet does not "give" you diabetes your genes do. Your diet will indeed make the symptoms of the disease obvious to you and once you know you have diabetes a specific diet will help you manage it. But if you do not have diabetes eating candy or anything will not "give" it to you.

Obesity, that is 'true' obesity is also genetic. A person with a normal weight and health probably couldn't become 'obese' even if they wanted to. Not BMI 'obesity' which is some arbitrary one size fits all number but real obesity. If you are obese it can be a real challenge to diet and achieve a 'normal' weight.

Here is an interesting example of how dietary subjects are affected by personal beliefs/biases.

http://www.sciencealert.com/scientists-who-found-evidence-for-gluten-sensitivity-have-now-shown-it-doesn-t-exist