The ketogenic diet-also known as the keto diet-has gained traction in the past decade or so due to its alleged positive effect on weight management. The diet has been popular among celebrities including Gwyneth Paltrow. The Hollywood actress previously faced backlash from health experts who said there was a lack of evidence to support her suggested "healing" remedies, which included a keto and plant-based diet. But what are the pros and cons of a ketogenic diet and is it safe? Newsweek spoke to experts to find out. What Is a Keto Diet? A ketogenic diet is defined as a diet high in fat and low in carbohydrates (sugars), which causes the body to break down fat into molecules known as ketones. U.S. National Institutes of Health (NIH) explains. Fat: Around 55 to 60 percent of the diet. Protein: Around 30 to 35 percent. Carbohydrates: Around 5 to 10 percent (Note: Supraketo Fat Burner For a 2,000 kcal per day diet, carbohydrate intake would amount up to 20 to 50 g per day).
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Speaking to Newsweek, Dr. Kevin Hall, senior investigator at the NIH's National Institute of Diabetes and Digestive and Kidney Diseases, noted it's important to clarify that there are several versions of the "keto diet" and the health effects of these various types may be quite different. Some people follow a plant-based keto diet with no animal products that entails consuming lots of fiber from non-starchy vegetables but very little starch or sugar, while other keto diets include a lot of animal products but very few non-starchy vegetables. What is the Carnivore Diet? Some versions of the diet contain less red meat and processed meat, less saturated fat as well as more fish and plant-based fats that have lower levels of saturated fat. But the commonality of all these keto diets is that "they are all sufficiently low in dietary carbohydrates that the body increases its production of ketones, resulting in elevated blood levels of ketones," Hall said.
Ketones are substances produced by your body if your cells don't get enough blood sugar (glucose). Glucose is the main energy source for your body. What Happens to the Body on a Keto Diet? Due to there being a low level of carbohydrates available for energy, your body breaks down fat into ketones, which become the primary source of fuel for the body. Ketones provide energy for the heart, kidneys and other muscles such as the brain. A ketogenic diet is essentially considered "a partial fast," explains the Academy of Nutrition and Dietetics. A keto diet helps reduce seizures in pediatric patients with epilepsy, the ASN's Psota added. For nearly a decade, the ketogenic diet was considered a "therapeutic diet" for pediatric epilepsy and was widely used until the introduction of antiepileptic agents, which led to the decline of the diet's popularity, the Ketogenic Diet book says. For example, compared to a typical Western diet that's high in ultra-processed foods, which contains lots of sugar and fat but are low in fiber, a ketogenic diet can result in weight loss, he explained.
According to the ASN's Psota, research suggests a keto diet may present potential benefits related to blood glucose (sugar) control, such as improving insulin sensitivity. The NIH's Hall said a keto diet may lower glucose and insulin levels in the blood, which may be beneficial for people with type 2 diabetes or pre-diabetes. When your body's blood sugar levels rise, it releases insulin, which lets the glucose into your body's cells to be used as energy. Diabetes patients either don't produce enough insulin or their bodies can't utilize the insulin as well as it should and too much blood sugar stays in their bloodstream. When you're on a keto diet, the body is deprived of carbohydrates and insulin secretion is significantly reduced. Ketogenesis provides the body with an alternate source of energy in the form of ketone bodies, replacing glucose as a primary source of energy. Among the short term health risks of keto diets are flu-like symptoms, referred to as the "keto flu." These may include upset stomach, headache, fatigue and dizzy spells, while some have also reported trouble sleeping, according to the Academy of Nutrition and Dietetics.
The keto diet requires either "cutting out or drastically reducing" many nutrient-dense foods, such as fruits, vegetables, and grains. This can lead to micronutrient (i.e. vitamin and mineral) deficiencies over time, said the ASN's Psota. Keto diets limit your intake of grains, starchy veggies, beans, lentils, fruits, vegetables and dairy products. All of these foods are loaded with essential vitamins, minerals, antioxidants and dietary fiber, the registered dietitian nutritionist said. The ASN's Psota said one way to avoid these "micronutrient deficiencies" while on a keto diet would be to take a multivitamin supplement. The low intake of dietary fiber may cause constipation, Ehsani said. Those on a keto diet are often required to take a fiber supplement to maintain regular bowel movement. These concerns may be mitigated by decreasing the saturated fat content of the diet and replacing it with sources of monounsaturated fats, Supraketo but more research is needed on this topic, he said. The potential for high levels of LDL cholesterol ("bad" cholesterol) raises the risk of heart disease in keto dieters, the ASN's Psota said. According to the Academy of Nutrition and Dietetics, a "considerable body of research" has shown diets high in saturated fat may increase the risk for heart disease and other chronic health problems. Kidney stones and liver disease are among the other long-term health risks of a keto diet. Ehsani from the Academy of Nutrition and Dietetics said the keto diet is by nature very restrictive and therefore not sustainable.