What are the negatives of the keto diet?
Sarah Smith
Published Jan 12, 2026
Three cons
What are the negative effects of a keto diet?
7 Keto Risks to Keep in Mind
- May lead to the keto flu. ...
- May stress your kidneys. ...
- May cause digestive issues and changes in gut bacteria. ...
- May lead to nutrient deficiencies. ...
- May cause dangerously low blood sugar. ...
- May damage bone health. ...
- May increase your risk of chronic diseases and early death.
Why you should avoid keto?
Considering these risks, people who have kidney damage, individuals at risk for heart disease, pregnant or nursing women, people with type 1 diabetes, pre-existing liver or pancreatic condition and anyone who has undergone gallbladder removal shouldn't attempt the Keto diet.
How long should you do keto for?
Registered dietitians warn that nutrient deficiencies may be possible if you're on it for too long. Stick to the keto diet for three to six months max, says Mancinelli, noting that some people opt to cycle in and out of the diet throughout the year.
What are the pros and cons of keto diet?
The Pros and Cons of a Keto Diet
- Pro: Weight loss. ...
- Con: Fewer Carbs isn't necessarily a good thing. ...
- Pro: It might be helpful for the days spent at your desk job. ...
- Con: You may not be getting enough sugar. ...
- Pro: It may help prevent Cancer. ...
- Con: It could have a negative impact on heart health. ...
- Final Thoughts.
Is keto healthy or not?
Mayo's verdict: While the ketogenic diet may be recommended for some people with uncontrolled epilepsy, the high fat content — and especially the high level of unhealthy saturated fat — combined with limits on nutrient-rich fruits, veggies and grains is a concern for long-term heart health.
Does a keto diet cause hair loss?
Before you started the ketogenic diet, you may have been aware of some of the side effects, like fatigue, constipation, and nausea. Others — like potential hair loss — may come as more of a surprise. For some people, loss of hair is a very real ramification of the ketogenic (or keto) diet.
Does the keto diet make you angry?
The keto diet is low in fibrous foods like grains and legumes. Fuzzy thinking and mood swings. "The brain needs sugar from healthy carbohydrates to function. Low-carb diets may cause confusion and irritability," McManus says.
Can you drink alcohol on keto?
Keto-Friendly Drinks
For instance, pure forms of alcohol like whiskey, gin, tequila, rum and vodka are all completely free of carbs. These beverages can be drunk straight or combined with low-carb mixers for more flavor. Wine and light varieties of beer are also relatively low in carbs — usually 3–4 grams per serving.
Which carb is the healthiest?
12 High Carb Foods That Are Incredibly Healthy
- Quinoa. Quinoa is a nutritious seed that has become incredibly popular among health-conscious consumers. ...
- Oats. ...
- Buckwheat. ...
- Bananas. ...
- Sweet potatoes. ...
- Beets. ...
- Oranges. ...
- Blueberries.
Is keto good for skin?
It is logical to conclude that this diet has a positive impact on the skin. By consuming healthy fats and lowering sugar consumption, inflammation and oxidative stress will decrease. The keto diet may also prevent skin cancers, improve acne, and lessen the appearance of varicose veins.
Do you sleep less on keto?
Insomnia caused by the keto diet is attributed to low levels of serotonin and melatonin, as well as higher than normal energy levels. Long-term, the keto diet can lead to deeper sleep and less required sleep overall.
How much water should I drink while on keto?
Alternatively, health experts recommend drinking around 64 ounces of water daily if you are following the ketogenic diet, with men needing to drink about 5 glasses of water more than women a day.
Which diet is the healthiest?
Perhaps the world's healthiest diet, the Mediterranean diet is abundant in fruits, vegetables, whole grains, legumes and olive oil. It features fish and poultry—lean sources of protein—over red meat. Red wine is consumed regularly but in moderate amounts.
Can keto make you sick?
People following the ketogenic diet may experience minor, short term symptoms, such as nausea, fatigue, and headaches. Some call this the keto flu. Another name for the keto flu is keto induction, as these symptoms tend to occur when people start the diet.
What vegetables are keto?
Keto vegetable list
- asparagus.
- broccoli.
- cabbage.
- cauliflower.
- mushrooms.
- cucumber.
- green beans.
- eggplant.
Why do you poop less on keto?
The keto diet may initially cause constipation as your body gets used to digesting fewer carbs and more fat. But as your GI tract adjusts to this way of eating, you may find that it becomes less of an issue.
How do you know if keto is working?
Having ketones in the blood is probably the most definitive sign that someone is in ketosis. Doctors may also use urine and breath tests to check for ketone levels, but these are less reliable than blood samples. A special home testing kit allows people to measure their own blood ketone levels.
Do I have keto flu?
The so-called keto flu is a group of symptoms that may appear two to seven days after starting a ketogenic diet. Headache, foggy brain, fatigue, irritability, nausea, difficulty sleeping, and constipation are just some of the symptoms of this condition, which is not recognized by medicine.
Do you burn fat while sleeping on keto?
According to a recent study, losing sleep can actually inhibit fat loss. Participants in the study that lower-quality or less sleep lost the same amount of weight as the group that received adequate sleep. However, the group that slept better lost more fat. Burning bodily fat is the cornerstone of keto.
Does keto cause weird dreams?
A study on the keto diet and sleep found a distinct increase in both sleep quality and REM sleep— that's the sleep stage where we have the most vivid dreams[*].
Do you wake up in ketosis?
Late-night eating can also cause you to be in ketosis at night, but not in the morning. Typically, this happens when you eat carbs late in the day and then go to sleep. As your body's metabolism slows down while sleeping, the carbs are not burned as quickly and they kick you out of ketosis.
Does keto make you smell?
Womens Health explained that when your body was in ketosis (breaking down fat for fuel instead of carbs), it produces ketones (chemicals like acetoacetate, beta-hydroxybutyrate and acetone) — these are chemicals naturally produced by your body, but because your body produces more of them on the keto diet, the excess ...
How does keto change your face?
Too much fat from the keto diet can cause breakouts.
"Because this diet is high in fat, it increases the production of sebum on your skin," said board-certified dermatologist Dr. Debra Jaliman. "This overproduction of sebum may lead to acne," she added.
Does keto cause wrinkles?
Keto diets are posited to help firm up the skin because they are very low in carbs and refined sugars. Too much sugar in the diet leads to glycation (the binding of sugars to protein), which in turn weakens collagen and leads to wrinkles, fine lines and sagging skin.
