Why does your stomach get big when you starve?

To understand the reasoning for this, it is important to know that in malnourishment, the rounded abdomen is not due to fat accumulation. Instead, the water retention and fluid buildup in the body cause the abdomen to expand. This results in a bloated, distended stomach or abdominal area.

borgenproject.org - Why Malnourished People Have Bloated Stomachs

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In the United States, we have generally come to associate a bloated stomach with obesity. Counter-intuitively, the same notion applies to undernourished or malnourished people. Many forms of malnourishment – the most widely known of which is Kwashiorkor – are characterized by bloated, distinctively rounded stomachs.

Kwashiorkor: The Bloated Bellies of Malnourished People

Although many forms of undernutrition, as well as malnutrition, can manifest in a characteristic big abdomen, Kwashiorkor is the most commonly known form of malnutrition with this symptom. To understand the reasoning for this, it is important to know that in malnourishment, the rounded abdomen is not due to fat accumulation. Instead, the water retention and fluid buildup in the body cause the abdomen to expand. This results in a bloated, distended stomach or abdominal area. The physiological reasoning behind this is the specific lack of certain nutrients, which determine which kind of nutritional deficiency it is. In Kwashiorkor, for instance, the caloric intake of the children affected is fine in that is it is not lacking in the energy needed by the body for metabolic processes. However, the diet is severely lacking in certain nutrients, particularly proteins. Proteins in the body are responsible for the balance of osmotic pressure in the body, besides their structural roles. Proteins are generally macromolecules, which means that they are sizably large and not easy to transport through cells permeable membranes. The proteins can pass through the membranes only through special mechanistic procedures in the membranes and are otherwise found in the blood serum or lymph. The presence of proteins in the lymphatic system of the body leads to a higher osmotic pressure in the lymphatic fluid, as compared to the water in the gut. This hypertonicity causes fluid to flow from the gut into the lymph fluid and eventually into the blood stream. The regulation of water maintains a healthy distribution of water throughout the body. If this regulation is compromised due to protein deficiency, the buildup of fluid leads to distention of abdomen as well as fluid retention or edema. Another function of the proteins is to act in reverse of the hydrostatic pressure to maintain osmotic pressure in the tissues. The presence of proteins in the bloodstream of capillaries keeps water inundation of tissues in check. Proteins being larger molecules do not seep out of capillary walls like water does. Therefore, the presence of these proteins inside the capillaries creates colloid osmotic pressure. This regulates the uptake of water back into the bloodstream, so the tissues are not over saturated with water. With a lack of proteins due to malnutrition, this mechanism of regulation is stunted and water builds up in tissues as well. The buildup becomes more pronounced in the more severe cases, with fluid retention becoming apparent in other parts of the body besides the abdomen as well, such as facial areas. The cure for edema developed due to malnutrition is to replenish the body with lacking nutrients. It is common practice to deliver simple carbohydrates and fats before administering proteins to achieve a normal blood pressure. The symptoms of malnourishment including distended abdomen may take a few days to alleviate. However, the impact on future growth and physical strength of children affected by this is permanent in nature.

– Atifah Safi

Photo: Indiana Public Media

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Why can't I stop eating even when full?

Some people who overeat have a clinical disorder called binge eating disorder (BED). People with BED compulsively eat large amounts of food in a short amount of time and feel guilt or shame afterward. And they do so often: at least once a week over a period of at least 3 months.

webmd.com - Why Can't I Stop Eating? How to Curb Compulsive Eating - WebMD

Think back to the last time you ate so much you felt absolutely stuffed. Were you tearing into a huge cake to celebrate a friend’s birthday? Loading up on turkey and sweet potatoes at Thanksgiving? Or were you at home alone, maybe at the end of a tough day? How did you feel afterward -- simply annoyed that you gave yourself a stomachache? Or were you tormented by guilt or shame?

Eating too much every once in a while is normal. So is eating for emotional reasons. “From the moment we’re born, we’re nurtured with food, rewarded with food, and so emotional connections to food are normal,” says Michelle May, MD, author of Eat What You Love, Love What You Eat. People who compulsively overeat, though, may use food as their only way of coping with negative emotions. As a result, they often feel that their eating is out of control. They think about food all the time and feel guilty, ashamed, or depressed after eating. “That’s very different from what someone feels after, say, eating a big Thanksgiving meal,” May says. “You might feel full, and you might regret having had that last slice of pie, but you’re not consumed with shame.”

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