The best diet is the one that suits you.
Some people thrive on a high carb, red-meat diet that would wreck another person’s health, whereas a vegan or exclusion diet would be a disaster for someone like me who loves their food.
I adopt a pick and mix attitude to eating, such as dietary advice and food recommendations, but not the actual recipes. I’ll try anything once, but if I don’t like it, not a second time.
Personal choice for me is lots of fruit and veg, granary/wholemeal bread, natural yoghurt, cereals, red meat once a week, white meat 2-3 times, but only in the main meal, moderate amounts of dairy, no alcohol, dark chocolate only when I fancy it (not often), eggs cooked without oil, limit potatoes/rice/pasta to twice a week, use agave syrup or honey instead of refined sugar, drink herbal and decaf teas, watered down fruit juice, eat nuts that are roasted but not salted, probiotics daily and supplements only if I need them.
This works for me, and I average 1400 calories a day, around 500 on a fast day if I really cut down.