The author cautions about the present emphasis on raw vegetables, especially those rich in fiber, for individuals with digestive problems. Often, the nutrients are bound into a matrix of fiber in the plants. Heating hard vegetables such as carrots or broccoli gently breaks down the fiber, and allows the human body to absorb much more of the vegetable's nutrients. Only vitamin C is found in high concentrations in raw vegetables. Its loss in cooking is offset by the gain in absorption of other nutrients.
Cooking also renders starch more digestible.
We benefit more from vegetables such as cauliflower, which contains large amounts of starch, when the vegetable is cooked. If the ileum is diseased, disordered, or removed surgically, there is difficulty in absorbing vitamin B12, some forms of fat, and results in increased oxalates in the urine, leading to kidney stones. For those with heartburn and peptic esophagitis, the author advises the individual not to lie down or go to bed with a full stomach directly after eating. Also, carbonated beverages should be avoided because they further distend the stomach with the release of dissolved carbon dioxide. Acidic foods such as citrus fruits may need to be avoided as well.