Unlike starch, cellulose has great structural strength, due partly to the difference in bonding. We should consume enough fiber. There are three kinds of fiber. Then, the coating of the grains is another fiber which is good for bowel movements, especially for people suffering from chronic constipation. Lastly, is fiber from vegetables, which is good for the intestines and for digestion.
Fats are essentials for our health.
In this image, you will see single bonds between carbons. This is a typical stearic acid but beef fat, which is composed of triglycerides with a high proportion of stearic acids, the fatty acid chains packed closely together, forming a solid at room temperature. Many people eat fat which is not good for them. Phospholipids are similar to fats or oils, except that only two fatty acid tails are attached to the glycerol backbone. Cerebral phospholipids are found only in the brain.