The less processed food is, the better.
It is just as healthy to eat a vegan or vegetarian diet as to be an omnivore. In some respects somewhat better.
However all manmade foods have their downsides and deficiencies.
Even Americans who have tasted a fresh Mediterranean diet can recognise the deficiency of a highly processed American diet majoring on fast food, and genetically modified plant and animal food stuffs.and chemically washed produce.
A majority of the world is now eating highly processed and factory produced foods.
Obesity, diabetes and the many related health problems, leading to organ failures and cancers are now endemic and are largely the result of an unhealthy and inappropriate diet and life style.