On the whole, I have found the majority of people do well on an omnivorous diet which offers a moderate amount of meat and fish, plenty of vegetables, sweet fruit as a treat, and lots of healthy fats such as those found in coconut oil, olive oil and grass-fed butter. There is so much variation in how people react to dairy and grains, that those must be tested individually. Minimally processed dairy originating from grass-fed animals is more optimally available to the body than industrially-produced dairy. This has to do with fundamental changes that occur to this type of food during homogenization and pasteurization.
Some people do very well on a vegetarian diet. If someone has good energy, good skin and good brain power on a vegetarian diet, I say carry on. By the same reasoning, it’s important that we eat in a way that satisfies our biology over our politics. I believe this is why we’re seeing more hybrid eating styles emerging, such as Flexitarian and Pegan. I support the work of the website beyondveg.com, which offers guidance to vegetarians who find they do not flourish on a vegetarian diet, and helps them find ways to fill out their diet beyond plant-based sources, while still taking ethical considerations into account. Some people sadly feel that they are letting down an entire movement, simply because their bodies are crying out for a diet more biologically appropriate for them.
Likewise, some people – while enthusiastically reducing sugar and carbs – fall into the trap of eating too much protein, which can also produce negative health consequences. This is why I love the work of organizations like Whole 30 and Bulletproof, who espouse eating large amounts of vegetables, adequate amounts of good fat (so critical for the brain and endocrine system), and modest amounts of high-quality protein. This is my personal approach to food.
It’s critical to remember than in the course of human history, human beings have eaten just about everything there is to eat, and flourished in different regions on different diets. This is why it’s a fool’s errand to search for the absolute “right” way to eat. What’s right for one person may be wrong for another.