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A Note From the Editors
The Spruce Eats does not endorse this diet; rather, we are providing some information that can contribute to your decision. Please talk with your doctor or a registered dietitian before making any significant changes to your diet.
The ketogenic—or “keto”—diet is one of the most popular eating plans around. But how exactly does it work? And how will your eating habits change if you follow it correctly? Here’s a brief overview to help you understand what to eat, and what not to eat, on the keto diet.
The ketogenic diet is a very low-carbohydrate, high-fat eating plan with a moderate amount of protein. When followed carefully, the keto plan triggers a state called ketosis. It typically takes a few days to a couple of weeks to reach this state.
What does ketosis mean? Well, ordinarily when we eat enough carbohydrates (and to a lesser degree, protein) from food, the body produces glucose for cells to use for energy. In contrast, if you significantly reduce your carbohydrate intake (as in the keto diet), this triggers your body to burn stored fat. This, in turn, creates a type of acid called ketones, which the cells can use as fuel. The state of having an excessive concentration of ketones in the bloodstream is called ketosis.
Doctors have been using the keto diet for nearly a century to treat drug-resistant epilepsy in children. These days, most people rely on the keto regimen for weight loss; others may use it to lower blood glucose levels in type 2 diabetes, although research suggests such severe carbohydrate restriction is unnecessary.
Most people on the keto diet follow a formula for how many of their daily calories come from fat, protein, and carbohydrates. The following is based on a 2000-calorie eating plan.
- Fat: 70 percent to 80 percent of daily calories; 155-177 grams
- Protein: 10-15 percent of daily calories; 50-75 grams
- Carbohydrates: 5-10 percent of daily calories; no more than 20-50 grams
To meet these requirements, keto dieters dine on fatty animal foods, such as meat and cheese, poultry, fish, eggs, and added fats, while limiting or excluding fruits, vegetables, grains, and sweets.
Carbohydrate restriction is central to ketosis. Some followers tally “net carbs,” by subtracting the grams of fiber in food from the total carbohydrate content, with the idea that fiber doesn’t disrupt ketosis because it’s indigestible. However, the science surrounding this concept is fuzzy, and “net carbs” is not recognized by the U.S. Food and Drug Administration. Calculating your total carbohydrates for the day is the most accurate way of tallying them.
Note that there are different types of diets that claim to be keto, but not all of them will necessarily put you into ketosis. Just because a diet is low in carbs doesn’t mean it’s keto.
Pros and Cons of the Ketogenic Diet
- It’s possible to lose weight on the keto eating plan. That said, a 2019 review of the evidence found that very low carbohydrate diets are not superior to other dietary approaches for weight loss, such as moderate calorie restriction.
- The same report also found that the keto diet may lower triglyceride levels in the blood and reduce the amount of medication necessary to manage type 2 diabetes.
- Preliminary evidence suggests that ketosis enhances brain function in people who have mild cognitive impairment caused by Parkinson’s disease, and may be useful in managing other neurodegenerative diseases. More long-term studies in humans are needed to determine the safety and efficacy of the ketogenic diet in chronic disease.
- Many followers of ketogenic diets experience hunger, fatigue, low mood, irritability, bad breath, dizziness, headaches, and brain “fog,” as they transition to ketosis. Most of these symptoms subside once ketosis is reached.
- The keto diet is restrictive and requires diligence and dedication.
- You may feel deprived of your favorite foods or become bored with the limited selection.
- It’s necessary to educate yourself about the nutrients in foods in order to adhere to carbohydrate and protein limits and to consume enough calories as fat.
- Low intake of dairy foods, fruits, vegetables, and whole grains can result in deficiencies in several nutrients that must be addressed with dietary supplements.
- The keto diet lacks phytonutrients, which are beneficial plant compounds that help defend cells from damage. In addition, the plan is low in fiber, which can cause constipation and may influence overall health by affecting the gut microbiome.
- Depending on food choices, the keto diet can be high in saturated fat, which is linked to clogged arteries that increase the risk for heart disease.
Who Is the Ketogenic Diet Not For?
Children and teens should never consume a ketogenic diet without supervision from a registered dietitian/nutritionist (RDN) who is an expert in pediatric nutrition. Pregnant and breastfeeding women, those with disordered eating, the elderly, and people with kidney disease, pancreatic disease, thyroid disease, gallbladder disease, and other chronic conditions should also avoid the ketogenic diet.
What to Eat on the Ketogenic Diet
Lower-carbohydrate foods are the mainstays of the keto diet. Meat (including processed meats such as ham, hot dogs, and salami), poultry, seafood, nuts, seeds, oils, butter, lard, heavy cream, full-fat sour cream, olives, and avocados, are part of the keto plan. Berries, and most non-starchy vegetables, such as green beans, cauliflower, asparagus, and onion, are also permissible. As for dairy foods, hard cheeses, including cheddar, Monterey Jack, and Havarti, are on the menu, as is full-fat cottage cheese and plain yogurt. Unsweetened coffee and tea, and unsweetened cocoa powder, are also part of the keto regimen.
The important thing is how all of your food for the day adds up. People following the keto diet must calculate how to spend their daily carbohydrate “allowance.” So even a lasagna recipe formulated to be keto-friendly can deliver so many carbohydrates per serving (in this case, 19 grams) that there’s little room for any other carbohydrates that day. Additionally, you will need to make sure you’re not eating too much protein, which can interfere with fat burning; and you will need to make sure you’re eating enough fat, or you could slow down your metabolism.
In other words, don’t assume that three square meals from recipes or dishes labeled “keto-friendly” will keep you in ketosis.
What Not to Eat on the Ketogenic Diet
If you’re following the keto plan to the letter, many foods are off limits. It’s likely you will have to avoid all fruit, with the exception of berries, and most vegetables, including potatoes, corn, carrots, beets, and all types of winter squash, as well as legumes, such as black beans, chickpeas, and lentils. Added sugars and sweets, whole and refined grain foods, including bread, oatmeal, and pasta, milk, and sweetened yogurt, are all largely off limits, too.
The ketogenic diet is a restrictive plan that’s helpful for controlling certain types of epilepsy in children and promoting weight loss in adults, and one that may play a role in managing some neurodegenerative conditions, including Parkinson’s disease. Limited carbohydrate intake is the premise of the keto plan, which prompts the body to burn fat and produce ketones to use for energy. Following a keto regimen requires diligence and discipline, and the diet produces some undesirable, but fleeting side effects. Many people, including those with certain chronic conditions, should not try the keto diet.
Always consult your doctor before starting the keto diet and work with a registered dietitian/nutritionist to monitor your progress and to ensure that you meet your nutrient needs.
Martin-McGill KJ, Bresnahan R, Levy RG, Cooper PN. Ketogenic diets for drug-resistant epilepsy. Cochrane Database of Systematic Reviews 2020, Issue 6. Art. No.: CD001903. DOI: 10.1002/14651858.CD001903.pub5
Alison B. Evert, Michelle Dennison, Christopher D. Gardner, et al. Nutrition Therapy for Adults With Diabetes or Prediabetes: A Consensus Report. Diabetes Care 2019;42:731–754 | https://doi.org/10.2337/dci19-0014
Boston 677 Huntington Avenue, Ma 02115 +1495‑1000. Diet review: ketogenic diet for weight loss. The Nutrition Source.
Interactive Nutrition Facts Label – Total Carbohydrate. FDA
Carol F. Kirkpatrick, Julie P. Bolick, Penny M. Kris-Etherton, et al. Review of current evidence and clinical recommendations on the effects of lowcarbohydrate and very-low-carbohydrate (including ketogenic) diets for the management of body weight and other cardiometabolic risk factors: A scientific statement from the National Lipid Association Nutrition and Lifestyle Task Force. Journal of Clinical Lipidology (2019) 13, 689.711
Krikorian R, Shidler MD, Summer SS, et al. Nutritional ketosis for mild cognitive impairment in Parkinson’s disease: A controlled pilot trial. Clin Park Relat Disord. 2019;1:41-47.
Dariusz Włodarek. Role of Ketogenic Diets in Neurodegenerative Diseases (Alzheimer’s Disease and Parkinson’s Disease). Nutrients 2019, 11, 169; doi:10.3390/nu11010169
Barbara Gordon, RDN, LD. What Is the Ketogenic Diet? Academy of Nutrition and Dietetics
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How to Start a Keto Diet
The ketogenic diet has been rising in popularity, and for good reason — it is simple and yields significant results. Whether you want to lose fat, increase energy, enhance brain health, improve your blood sugar levels, or improve your overall health, keto may be the diet you are looking for.
However, before we learn how to start a keto diet, we must develop a deeper understanding of what it is and why it is so effective. Knowing the what and why behind this way of eating plays an integral role in your keto diet success as well as knowing how to get started.
For more in-depth information about starting the ketogenic diet check out the full article on Ruled.Me: https://www.ruled.me/how-to-start-a-keto-diet/
See more keto recipes, knowledge and tips on the website to keep your weight loss going strong.
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