What Is the Keto Diet: Its Risks and Negative or Harmful Effects

 The keto diet is popular for rapid weight loss. However, such a diet can create adverse reactions in the body. Many young people begin the keto diet on their own without seeking advice from a specialist dietitian, which can be extremely dangerous.

What is the Keto Diet?

The keto or ketogenic diet is a high-fat, low-carbohydrate, and moderate-protein eating pattern. The main goal of this diet is to bring the body into a metabolic state called “ketosis,” where the body uses fat instead of carbohydrates as its primary source of energy. Typically, daily carbohydrate intake must be reduced to below 5–10%, while fat intake should be around 60–70%. As a result, foods like bread, rice, pasta, potatoes, sugar, fruits, and even many types of vegetables must be avoided. On the other hand, high-fat foods such as meat, eggs, butter, ghee, cheese, nuts, and olive oil are consumed in larger amounts. Although many people follow the keto diet for quick weight loss, this eating pattern comes with serious risks and negative effects that can unknowingly lead to major health problems.

Negative and Harmful Effects

First, due to very low carbohydrate intake, the first few days or weeks often cause symptoms known as “keto flu.” These include headaches, fatigue, nausea, dizziness, excessive loss of fluid, lack of concentration, irritability, and sleep problems. The body takes time to shift from using carbohydrates to burning fat for energy. During this physiological adjustment, many people feel extremely weak. Additionally, an imbalance of sodium, potassium, and magnesium in the body can lead to muscle cramps, spasms, and irregular heartbeat.

Second, long-term keto dieting can put stress on the liver and kidneys. Since this diet involves high fat and moderate protein, the liver must work harder to break down fat for energy. If someone already has liver issues, the keto diet may worsen the condition. Similarly, excess protein intake increases pressure on the kidneys’ filtering system, especially for individuals with weak kidneys or diabetes. Studies show that long-term keto dieting increases the risk of kidney stones because high calcium levels cause crystals to form in the urine.

Third, this diet often excludes fruits, many vegetables, grains, and legumes—foods that are essential sources of fiber, vitamins, and minerals. Low fiber intake commonly leads to constipation. A lack of vitamin C, B-complex vitamins, potassium, magnesium, and antioxidants can weaken immunity in the long term. As a result, infections, skin problems, hair fall, and brittle nails may occur. Very low carbohydrate intake may also cause depression, mood swings, and reduced cognitive performance.

Fourth, many think the keto diet is good for the heart because it is low in carbohydrates. But in reality, consuming excessive fat can increase cholesterol levels. High intake of saturated fats raises LDL or “bad cholesterol,” which increases the risk of heart disease, heart attack, or stroke. Research shows that many long-term keto followers experience higher cholesterol and fat buildup in arteries. Therefore, the diet may be dangerous for individuals at risk of heart disease.

Fifth, the keto diet can also have negative social and psychological effects. Because the food list is very limited and many common foods are restricted, people often struggle to follow it during social gatherings or family meals. This reduces the joy of eating and may lead to stress or feelings of isolation. Strict dieting can also promote unhealthy eating behaviors or increase the risk of eating disorders.

Sixth, the keto diet is not effective for everyone. Some people lose weight quickly, while others struggle to adapt. When the diet is stopped and normal eating resumes, weight often comes back rapidly, as carbohydrates cause the body to retain water and calorie intake increases again. This leads to the “yo-yo effect”—repeated cycles of weight loss and gain—which is harmful to overall health.

Risks of the Keto Diet

The keto diet is particularly risky for pregnant women, breastfeeding mothers, individuals with hormonal imbalance, and patients with arthritis. In growing age, this diet can disrupt the menstrual cycle in females, potentially causing infertility later. No one should follow the keto diet without expert advice.

Many people begin this diet solely based on information from the internet. However, starting the keto diet without understanding the body’s needs can be a harmful, self-destructive decision. By following a balanced diet along with regular exercise as recommended by a healthcare specialist, achieving good health is not difficult.

Conclusion

Before starting the keto diet, it must be remembered that it is an extremely strict and restrictive eating pattern. Not everyone can follow it—especially pregnant women, diabetics, kidney or liver patients, heart patients, children, and adolescents are generally advised to avoid this diet. Many experts believe that the risks of long-term keto dieting outweigh its benefits. Therefore, instead of using it as the only method of weight loss, adopting a balanced diet, regular exercise, and a healthy lifestyle is the safest and most sustainable approach.