Without enough fat in the diet, hunger is not satisfied at mealtime, the skin becomes dry and brittle and mental clarity may become a problem, according to Self. This source adds that along with helping to dissolve fat-soluble vitamins, such as A, D, K and E, into the bloodstream, fat helps to build nerve tissue in the brain, maintain body temperature and provide padding for organs in the body.
Self advises that in women, if enough fat is not present in the diet, a loss of menstrual cycle may also occur. In addition to short-term effects, a diet with too little fat can create long-term effects, such as an increased risk of cancer, high cholesterol, heart disease and depression, according to Woman's Day. This source explains that 20 to 25 percent of a healthy person's daily diet's calories should come from fat. It goes on to say that when a person does not regularly eat enough fat, it is likely that he is compensating by overeating other types of foods, such as carbohydrates and protein. Woman's Day asserts that the key to maintaining health and preventing disease is to strike a balance between carbohydrates, fat, and protein in the diet.