Let’s look at the evidence. Diet has been studied very extensively, and there are some things that we know with a fair degree of certainty: there is reasonably convincing evidence that having a diet rich in fresh fruit and vegetables, with natural sources of dietary fiber, avoiding obesity, moderating one’s intake of alcohol, cutting out cigarettes, and taking physical exercise are protective against such things as cancer and heart disease. Nutritionists don’t stop there, because they can’t; they have to manufacture complication, to justify the existence of their profession.
