There's no best diet, there's just a diet that works for oneself. For me it's a ton of fruits (tomatoes, clementines, .. depending on the season), vegetables (onions with leaves, spinach leaves, herbs, peppers, aubergines, carrots...) vapor-cooked or boiled in water, occasionally with some white fish, and some rice to 'cement' a bit that, some honey. No sauce and no waste or almost, no drugs (this diet is like a natural drug for me). Doing some exercise the weekend on a bike. My BMI is always around 18 (60/1.83^2)