Many people eat as an outlet for stress. Very few people under stress will lose weight because they don't eat. In contract, they usually become lathargic, as if they're waiting for something good to happen. Frequent headaches are common among people with arthritis, Crohn's disease, irritable bowel syndrome, colitis and even lupus or multiple sclerosis. I seldom find a person with these illnesses who doens't say that stress is a big factor.
Stress usually means greater vulnerability to the common viruses that cause colds and flu.
This is because stress causes some blood proteins to decline. In reality, though, that isn't feasible. The best way to dissipate stress that can't be worked out by calmly and rationally talking through the situation is through exercise. This relieves tension, burns off extra blood fat and sugar, provides an outlet for elevated blood pressure and burns off adrenaline that causes a heightened metabolic rate. In other words, don't start eating processed meats or steak.