Good Morning:
A good book that draws upon numerous long term studies of diet and disease, including cancer, is “Eat to beat Disease” by Dr William Li. He is affiliated with Harvard Med School. In it he talks about five different areas or ways in which certain foods support or hinder our immune systems. It is a bit too complex to go into specifics here but the main takeaways are to eat foods every day that support each of these areas or functions. He cites numerous long term studies that support his recommendations. Keep unhealthy fats and sugars to a minimum. However, it’s not so much about restricting the food you like but making sure you eat the good stuff every day. Found this book in MD Anderson Cancer Center Library while visiting with a family member and we have been following it closely ever since.
Another oncologist says to add green tea to the diet. It helps with weight loss and studies show a connection to reduced rate of cancer. There is a good article on the benefits of tea in ‘Cancer Today’ 2023 (but I drink mine without sugar, as you really need to avoid sugar). As others have posted, the plant focused diet makes sense as it is lower in fat content.