6 harmful effects of dieting.

1. You may feel pain in your stomach

Whenever you suddenly change the way you eat, you may develop gastrointestinal symptoms, such as an upset stomach. Various factors cause digestive problems, which may include nausea, diarrhea, and abdominal pain. Many low-calorie and low-fat diet foods contain food additives and artificial ingredients that may cause stomach upset. According to the Asthma and Allergy Foundation of America, food additives, such as artificial sweeteners, may cause allergy-like symptoms

 A desperate urge for specific food

There are lots of studies that look at the thinking processes that dieters have, and you see the same thing. Dieters are more likely to notice food, have a harder time removing their attention from food, and crave food more.” An imbalance of hormones, such as leptin and serotonin, could also lead to food cravings. Cravings also involve the appetite centers of the brain, even though they tend to be separate from hunger.

3. Slow metabolism and muscle loss

The major difference we notice when we lose weight is a decrease in body fat. Our fat cells actually do reduce in size as a result of this decline. They don't actually vanish. This reduction in fat cells signals that the body's fuel reserves are running low, which results in a decrease in the leptin hormone. Leptin generally reduces hunger and boosts metabolic rate; however, when leptin levels fall, metabolic rate slows and hunger levels rise.

4. Causes regret and depression

Consumption of diets low in carbohydrate tends to precipitate depression, since the production of brain chemicals serotonin and tryptophan that promote the feeling of well being, is triggered by carbohydrate rich foods. It is suggested that low glycemic index (GI) foods such as some fruits and vegetables, whole grains, pasta, etc. are more likely to provide a moderate but lasting effect on brain chemistry, mood, and energy level than the high GI foods - primarily sweets - that tend to provide immediate but temporary relief Many of the neurotransmitters in the brain are made from amino acids. The neurotransmitter dopamine is made from the amino acid tyrosine and the neurotransmitter serotonin is made from the tryptophan. If there is a lack of any of these two amino acids, there will not be enough synthesis of the respective neurotransmitters, which is associated with low mood and aggression in the patients. The excessive buildup of amino acids may also lead to brain damage and mental retardation. 

5. Change in sleep cycle

Insomnia is common amongst keto dieters, particularly early on in transitioning to the keto diet, according to Health line.

Here’s the science behind it:

Carbohydrates are typically the body’s main source of energy as they supply the body with a constant supply of glucose, and "improve entry of the amino acid L-tryptophan into the brain." Livestrong.com lists that L-tryptophan assists with the production of serotonin, which is a neurotransmitter known for calming the body, and contributing to better sleep and well-being.  Serotonin is converted into melatonin — the sleep hormone.

Since the ketogenic diet doesn’t include many carbs, dietary L-tryptophan isn’t included in the diet either, which can lead to low serotonin and melatonin levels.

6. May affect the menstrual cycle and can disturb

 sex life.

If you are restricting your calorie intake while still not meeting your nutritional needs, dieting can affect your length. It all comes down to stability. Consuming a  healthier diet may help your hormones because eating a wholly poor diet can contribute to PMS and is an indicator of estrogen dominance. Every other weight loss approach, including the ketogenic diet, has the potential to alter your menstrual cycle. High levels of fat and coffee levels are both parts of the ketogenic diet. It is widely hailed as a top-notch method of weight loss and does offer some epileptic patients some healing benefits. (It is not a good long-term diet for the vast majority of women, though, as it can lead to irregular periods or even cease them completely, which is an indication that the body is under stress..