There are a large number of diet and health relevant pages - but it is difficult to find authoritative pages. Here are a few that I have found. They are divided into two: foods to favour and fpods to avoid.
I first found peanuts for benign prostatic hyperplasia (they do work) but the more I read on them the more astonishing they are! Although technically high in calories it seems that you have to eat them by the bucket-full to put on any weight! The calories are non-fattening.
Improved Diet Quality with Peanut Consumption The link is to an abstract from The Journal of American College of Nutrition. The full text is available as a pdf. which indicates peanuts are non-fattening and have major health benefits. The study admits that the health benefits may, in part, be because people who include peanuts in their diet are generally eating other healthy foods. However - I think that is unlikely! The general consensus is that high calorie, high fat foods ate unhealthy. Peanuts are in that category, so I think it more likely peanuts are part of an otherwise bad diet. Looked at in that light the conclusions of the report are much stronger!
There are claims that eating virgin coconut oil can actually cause you to loose weight. Not sure I believe that, but certainly coconut oil is a special oil. The fact that peanuts are high in calories but do not seem to cause weight gain makes the claim about the weight-loss properties of coconut oil more credible.
Ray Peat is an endocrinologist who has a lot to say on diet, cancer, fats, oils. What he claims seemed somewhat incredible to me at first, but he quotes lots of learned research to back up his claims.
Coconuut oil (and the ois of most other nuts) contains medium chain fatty acids: these are metabolised in the body into medium chain triglycerides. These are apparently beneficial, not only in terms of weight control but also for cholesterol control.
Dietary fats, teas, dairy, and nuts: potential functional foods for weight control? Interesting, if rather technical, article from the American Journal of Clinical Nutrition on 'Functional Foods'. The statements about peanuts, coconuts etc on weight control could indeed have a scientific foundation! A pdf is available from that page.
African Rooibos Tea - Health Benefits a page from vegetarian-nutrition.info - it is free of tannins and caffeine, both contra-indicated to someone (the author!) with a hiatus hernia and Basrrett's oesophagus.
Wikipedia's article on carcinogens includes a section on carcinogens in prepared food. There are several links on this page to other relevant wikipedia articles.
Tea and Coffee Tea and coffee contain caffeine. As well as being a stimulant, this is thought by many to increase the body's acidity, though the scientific jury is still out on that!
Tea also is high in tannins. These tend to precipitate out minerals such as calcium and iron, making them difficult for the body to absorb.
There are many thing said about foods that increase the risk of cancer and fods that reduce the risk. A good review is Nutrition and Cancer: a Review of the evidence for an anti-cancer diet from the Nutrition Journal. Beware though that this is not an unbiased review as the author is employed by the Hallelujah Acres Foundation who have a diet that has been proven harmful. Nevertheless the fact that the data has been used to draw an invalid conclusion does not mean that the data is false.