Diet depends on body conditions, if someone is having any kinda diseases or somebody wants to lose weight etc. Diet depends on it, but for daily basis just to stay healthy and fit one must have balanced diet with enough exercise.
As its said, " An a apple day keeps doctors away "so daily eating apple is good one. But if you ask for best diet, my mom prefers to have variety of food fruits in our meal. Fruits, sprouts, nuts and green veggies. I avoid drinking fruit juices, cause its better to eat fruit rather than drinking juices.
With diet exercise is good practice for healthy lifestyle.Even if we don't get enough time for it then walking is good idea. So daily 20-30 mins walk is important.
Drinking Honey + Warm water daily, is also good, which helps us to stay fit. People also prefer Honey+Lemon+ warm water, as its said that it helps to reduce extra body fats.