I think those respondents are wrong- while I am a great believer in individual responsibility, people are really forced to a very great extent to feed themselves from the available foods in the supermarkets, guided by the medical profession and the government recommendations, both of which might be less than optimal. Many deficiencies are inherent in the consensus medical prescription for a healthy diet (the abundant portion of grain foods for one example) and the "low-fat" dictates for another. Obesity and diabetes have exploded with the low fat scheme, and grains are not a natural food for dogs or humans.