I just read the rest of Dr Coldwell's sites. He agrees with a lot of what has been discovered about diet and cancer, but this man wants to sell you something. He goes way beyond what has been proven, and buying is a big part of it. That means be careful! Many people are reporting that he is false and giving why they think so.
Lots of work has been done about the cancer/diet connection, but it is not centered on one man. Lots of work is also being done in regard to using God's word as a basis for deciding what foods are good, and again it is not based on selling you something or is is centered on any one person or idea.
An interesting finding is a chemical found in broccoli sprouts that the body uses to prevent cancer, but this isn't being tested by only one man, and scientific journals report on it. Also, these findings do not say to stop doing anything else to control cancer and rely on just their personal finding. That would be scarey.