It is not uncommon for people to claim that they have tried a vegan diet and it simply did not work for them. Not all vegan diets are healthy.
Much publicity is given to the longevity of the people of Japan and Okinawa (an archipelago that stretches from southern Japan to Taiwan). However, the population with the longest lifespan and the highest levels of health on the planet is the vegan Californian Seventh-day Adventists.
People are not predisposed to vegan diets or otherwise. When it comes to nutrition, we are pretty much the same – allergies being one significant difference.
Below are components of a healthy whole-food, plant-based diet. Many people on a unhealthy vegan diet are missing a number of important components of an optimal diet.