Paleo
The Paleo Diet can be quite a restricted diet, but you don't need to go back over 2 million years to follow it successfully. If you look at it under modern terms it's eating healthy basic foods and avoiding most of the foods which weren’t around even a few hundred years ago. It’s 'back to basics' eating which includes lots of vegetables, moderate protein, nuts & some fruit. The biggest success of this diet is avoiding processed foods, grains, dairy, sugar & legumes, as all of these can all been associated to inflammation in the body.
Sure, there can be lots of things added to recipes which are relatively modern, however they are all healthy ingredients which make sense in a modern diet. Due to Paleo's 'back to basics' eating approach it has helped many people that suffer from autoimmune disease, gut problems and many other ailments.