Best to eat antioxidants with meal, particularly berries. And drinking hibiscus tea or green tea between eating may help, too.

Greger suggests that accepted "average" iron levels are too high. Lower than average could help reduce cancer rates.

Only about 1 in 10,000 people live to be a 100 years old. What’s their secret?

So, is it just the luck of the draw whether we got good genes or bad ones? No, we can turn on and off the expression of these genes, depending on what we eat.

This is one way to explain the low rates of cancer among plant-based populations: The drop in animal protein intake leads to a drop in IGF-1, which in turn leads to a drop in cancer growth.

“Almost everyone is going to have a cancer cell or pre-cancer cell in them at some point. The question is: Does it progress?” said one of the lead researchers. That may depend on what we eat.