Is dairy good or bad for health? Is cholesterol evil? Does red meat kill or cure? Is the ketogenic diet a godsend or a health hazard?
Can the vegan, vegetarian, pescatarian, or raw food diet extend disease-free life? Nutrition is wrapped in multiple confusions.
Why is it so hard to determine whether a food is good or bad for health? In medical science, proving any theory is difficult.
The science of nutrition is no different, but it also has some unique challenges. In this feature, we outline just some of these stumbling blocks.