Holistic diets are the best IMO... I am no scientist, no health nut, no fruitopian, no doctor, no tailor, no soldier, no spy... But my understanding of Torah wisdom is that everything (which is at least kosher) which is not an obvious poison, in moderation, is not harmful. You are free to disagree with me, and judging from these threads lately nobody is agreeing with much of what anyone is saying.
I agree with Chaim on the point that fruits and vegetables are essential for keeping healthy. Regarding the amounts, the servings, I am not committed to any particular figures, but that a person at least consume some fruits and some vegetable during a two day period. I eat oranges and bannannas for fruit, and I have a salad of green vegetables every lunch, and usually carrots, peas, corn kernels, green beans along with my main meal (usually beef or chicken, alternating days)... I do like cheese, and have a pizza from time to time (I always miss the pizza during Passover, matzah pizza just doesn't do it)... I also sometimes nosh on a cheese bagel...
And while I am out of shape, my advice is to continue exercising while you can. Due to my health problem I do not take walks like I used to do in my 20s-30s, but walking is a good exercise and so is jogging (which my ex wife does)...
This is my advice, listen to others advice and learn from your experience... Everyone's life is not the same, and we should all try to help everyone live healthier. I appreciate Chaims discussions on this topic...