It comes down to simple mathematics. In order to stay in ketosis, you need to eat a very very low number of carbs. And if you eat too much protein, this can actually knock you out of ketosis as well. Therefore, if you're eating almost no carbs, and you are eating moderate amounts of protein, the ONLY remaining macronutrient you can consume to fill you up each day would be fat. Add in that consuming fat allows you to stay in ketosis, and you are consuming a high fat, medium protein, low carb diet.

Our bodies are incredibly adaptive to what you put into it “ when you overload it with fats and take away carbohydrates, it will begin to burn ketones as the primary energy source. Optimal ketone levels offer many health, weight loss, physical and mental performance benefits.1There are scientifically-backed studies that show the advantage of a low-carb, ketogenic diet over a low-fat diet. One meta-analysis of low-carbohydrate diets showed a large advantage in weight loss. The New England Journal of Medicine study resulted in almost double the weight loss in a long-term study on ketone inducing diets.
This means that if you have risk factors for heart disease ” such as elevated cholesterol levels, high blood pressure (hypertension), or a strong family history of the disease ” you should use caution when following this diet. The diet's heavy reliance on fat, especially saturated fat, can elevate cholesterol levels, further increasing your chances of developing heart disease in the future. (7)

Because the main tenet of the keto diet is counting and cutting carbs ” a commonly used way to control blood sugar ” this eating approach has become increasingly popular among people with type 2 diabetes who are looking to lower their A1C, which is the two- to three-month average measurement of blood sugar levels. Indeed, research suggests this diet may lead to fast weight loss and potentially lower blood sugar for people with the disease. (13)
Symptoms of the keto flu include headache, fatigue, dizziness, sleep problems, heart palpitations, cramps, and diarrhea. These side effects usually lessen and eventually resolve in about two weeks. (2) But to lessen the effects of any discomfort, simply consider slowly transitioning onto a ketogenic diet rather than rushing to change your eating habits. By slowly lowering your carbohydrate intake, while gradually increasing your intake of dietary fat over time, you can transition with less of a negative impact and potentially prevent the keto flu.
The keto diet changes the way your body converts food into energy. Eating a lot of fat and very few carbs puts you in ketosis, a metabolic state where your body burns fat instead of carbs for fuel. When your body is unable to get glucose from carbs, your liver converts fatty acids from your diet into ketones, an alternative source of energy. Burning ketones in place of glucose reduces inflammation and spurs weight loss.[1]
If this diet is so tough, then why has it been around since the 1920s? For starters, there's some evidence to suggest that ketogenic diets help regulate epilepsy, according to research in ISRN Pediatrics.Redox Biology reports the diet may benefit cancer patients. While it may be helpful for short-term weight loss, that wasn't the diet's original intention, and the jury's still out on its long-term effects.
Use our keto calculator to calculate the exact macros you should be eating. Remember, substituting more fat for carbs or protein is almost always ok. In fact, if you're worried about losing muscle mass because of decreased protein consumption, you may not need to worry. There has been evidence that while in a state of ketosis your body actually maintains protein better than in a standard diet.

Whatever the source of protein you consume, make sure they are organic grass fed and antibiotic-free, as they are generally healthier and safer for your body. In one study, researchers indicated that grass fed beef (regardless of cuts) contains more omega-3 acid and conjugated linoleic acid compared to grain-fed beef.21 As for non-meat sources of protein, try to look for organic and pesticide-free varieties.

Although a standard ketogenic diet is even more restrictive in terms of carb intake, a œmoderate keto diet (just as some folks have followed a modified Atkins diet) is another option that will very likely still be able to provide substantial weight loss results and other improvements in symptoms. Including slightly more carbs can be very useful for maintenance, allow for more flexibility, provide a higher fiber intake, and overall may feel more sustainable long term socially and psychologically.
¢ Potassium: With the approved list of foods being so brief, you might not be getting in enough fruits and veggies on keto. One of the biggest impacts? A potassium deficiency”and all of the lovely constipation and muscle cramps that accompanies it. Aim to up your intake of foods like spinach, avocado, tomatoes, kale and mushrooms to get your potassium fix.
After about two to seven days of following this eating routine, you go into something called ketosis, or the state your body enters when it doesn't have enough carbs for your cells to use for energy. Then it starts making ketones, or organic compounds that your bod then uses in place of those missing carbs”and oh, it also burns fat for more energy, says Beth Warren, R.D., founder of Beth Warren Nutrition and author of Living A Real Life With Real Food.
Going into nutritional ketosis by following a ketogenic diet is one of the most radical but highly beneficial lifestyle changes you can make to improve your health. As with most dietary changes, always remember to listen to your body. If you feel any side effects other than the ones listed above, then necessary adjustments to your food intake may be needed.
Before we discuss how to measure ketone levels, let's set some guidelines for optimal ketone levels. Nutritional ketosis is detected when levels begin to read at 0.5 mmol/L of ketones in the blood, but your optimal ketone level will depend on your personal goals. For instance, if your goal is to lose weight, your target ketone level will be lower than someone who wants to improve mental performance. The following table provides some general guidelines based on your goal.

Also make sure that you know what foods have mostly carbs, fat, and protein, so you can make the right choices. For instance, it's not just bread, pasta, chips, cookies, candy, and ice cream that contain carbs. Beans may contain protein, but they're also very high in carbohydrates. Fruit and veggies also mostly contain carbs. The only foods that don't contain carbs are meat (protein) and pure fats, like butter and oils (including olive oil and coconut oil).

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Medical Disclaimer: The material on this site is provided for informational purposes only and is not medical advice. Always consult your physician before beginning any diet or exercise program.

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