G.B.
Any surgery that "cuts off" absorption of foods and nutrition, or cuts out part of the stomach, is cancer waiting to happen. Good nutrition is the key to cancer prevention. Many overweight people are in fact, malnutritioned. They eat high amounts of food, but it is extremely low mineral/vitamin foods. Their body will tell them to eat because they are "nutritionally starving." but they keep eating empty foods. Food cravings come from mineral imbalances. The body is amazing in it's desire to survive. Those with magneisum deficiencies will crave chocolate. Those low on iron can crave ice, dirt, and other weird things.those in water dehydration mode will crave to eat at night, including sugar/salt foods.
The body's first line of defense against invaders is the immune system. They are the troops. Knock out the immune system by not feeding the troops, and see how well they are at fending off attackers....they cant-they are weak.
Fungus, cancer, parasites, bacterias, can invade quite easily and quickly under those conditions. (notice how aquired immune deficiency syndrome (aids) victims will succumb to all kinds of fungal and bacterial attacks.)Aids is VERY similar to cancer.
We can notice that old people, old animals, etc, start getting more health issues. The immune system gets more and more compromised as we age. They start getting shingles, toe and skin fungus, periodontal disease, cancers, heart problems, increased parasite colonies on the body...like fleas,, etc. In fact every just about every illness can be traced to a NUTRITIONAL deficiency and a compromised immune system at it's start.
The key is to change the food he eats. This should reduce his desire to overeat because he will be stopping the trigger foods. Cut those white flours and sugars totally out. No juices, only whole fruit. Have him start eating more organ meats. These are loaded with nutrition. Take magnesium supplements. and drink lots of water.
SOY and CORN are the two things that load the weight on.(corn includes corn syrup). They feed this stuff to food animals to fatten them for slaughter!! When the animals are grass fed, they are lean-lean -lean! These grains must be very reduced in the diet if you want to see a substantial weight change. Both affect the thyroid and metabolism. Do an internet search of "alternate names of soy/corn". Check your labels for those products.