“The most common definition of lazy keto is to eat no more than 20 grams of carbohydrates per day without counting calories or tracking the other macronutrients, protein and fat,†said Allison Knott, MS, RDN, CSSD, a registered dietitian based in New York City.
Increased focus and energyPeople often report brain fog, tiredness and feeling sick when first starting a very low-carb diet. This is termed the “low carb flu†or “keto flu.†However, long-term ketogenic dieters often report increased focus and energy.
Anecdotally, people report losses within the first week of anywhere from 1 pound (0.5 kg) to 10 or more pounds (5 kg). The larger you are, the more water weight you're likely to lose after starting keto. Although, it's unlikely that much of this initial weight loss is fat loss.
The main difference between these diets is carbohydrate intake. On a low carb diet, you typically eat 50–150 grams of carbs per day, but on the keto diet, daily carb intake is restricted to fewer than 50 grams.
Ketosis happens when your carbohydrate intake is low. As your body breaks down fat, it produces an acid called ketones or ketone bodies, which becomes your body and brain's main source of energy. Because ketosis shifts your metabolism and relies on fat for energy, your body can burn fat at a higher rate.
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.
There is evidence that various anxiety disorders result from dysfunctional GABA activity. Studies conducted on the use of the ketogenic diet in seizure disorders, for example, tend to show that a good balance of GABA leads to better mental focus, reduced stress and anxiety.
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.
“The ketogenic diet has been found to have profound effects on the gut microbiome, which appears to play a role in mental illness in some people,†said Palmer. An increase in studies published in medical literature has documented the effectiveness of the diet in treating bipolar disorder and schizophrenia.
The ketogenic diet was found to decrease the levels of metabolites of biogenic amines such as dopamine and serotonin which are neurotransmitters pivotal to the pathophysiology of depression (Dahlin et al., 2012). On the opposite, the ketogenic diet increased the levels of endogenous norepinephrine (Weinshenker, 2008).
According to the available evidence, ketogenic diets can have powerful benefits for the brain. The strongest evidence has to do with treating drug-resistant epilepsy in children. There's also preliminary evidence that ketogenic diets may reduce symptoms of Alzheimer's and Parkinson's disease.
Hunger and low-carbohydrate intake can have a dramatic effect on one's mood, Sullivan-Peters said. In the short term, the diet can lead to fatigue, irritability, constipation and headaches, a condition that some refer to as the keto flu.
“In the process of breaking down fat, the body produces ketones, which are then removed by the body through frequent and increased urination. This may lead to dehydration and flu-like symptoms, such as fatigue, dizziness, irritability, nausea, and muscle soreness.â€
Brain fog is no match for keto. Whether you're suffering from poor energy, reduced mental clarity, or trouble focusing, ketosis may improve symptoms by reducing oxidative stress in the brain, giving your neurons more energy, and boosting neurotransmitters that benefit mental health and function.
In the short-term, the keto diet can cause interrupted sleep and insomnia. 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.
You can combat the keto flu by staying hydrated, replacing electrolytes, getting plenty of sleep, avoiding strenuous activities, eating enough fat and cutting out carbs slowly over time.
6 signs the keto diet isn't actually working for you
- You are experiencing vitamin deficiency. Your body might be lacking in important nutrients.
- You feel a high level of exhaustion.
- Getting a good night of sleep has become a problem.
- You are having digestive issues.
- You are not in ketosis.
- There is no weight loss.
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.
