After exercise, nutrition is the top factor in prevention of disease, including cancer. Eating the right foods, in general, and the right specific foods during illness can have a profound effect on quality of life and also recovery.
The question is, however, which foods and spices are the most beneficial during cancer treatment and beyond.
The standard American diet is a bit heavy on simple carbohydrates. In addition, because it is also high in processed foods, nutrient deficiencies, like magnesium, Vitamin D and omega 3 fatty acids, are quite common. In general, a shift towards diets containing ample portions of protein, complex carbohydrates, good fats and low simple carbohydrates (25 grams for women and 35 grams for men per the American Dietetic Association) and five servings of leafy greens and fruit is beneficial. Diets should include minimal soda as well as minimal artificial sweeteners. Whenever possible use high burning oils, like coconut oil, to cook with if you are frying foods. Using whole, unprocessed foods containing minimal preservatives are also a good bet. An example of this would be using real butter instead of margarine as a condiment.
Conventional cancer treatment ...