Many people can see the logic behind the Paleo diet: humans are animals genetically designed to eat foods found in nature, not to have mobile phones, travel by train or drink tea with fruit caviar.
Eating seasonal foods is a healthy, affordable decision that benefits your health. If you eat these foods out of season, they are more expensive and have less flavour.
When we start watching what we eat, we tend to remove fat from our dishes and cooking, thinking that there aren't any appetising alternatives to boiling, which means we end up getting bored with everything and throw in the towel.
It goes without saying that you should eat fruit every day, the recommended daily allowance is 3-4 servings. They hydrate, give you energy, fibre, vitamins, minerals and other beneficial substances like antioxidants.
A vegetarian diet (in any of its variants) is healthy and people who follow this diet often lead more active lifestyle, which makes it even more beneficial.