But what does the science say? Results are mixed. In one Spanish study of 20 obese adults, participants were put on a low-calorie keto diet and lost an average of 40 pounds over four months. Another small experiment had a similar outcome. In a six-month Experimental & Clinical Cardiology study of 83 obese adults, those on the keto diet lost an average of 33 pounds, while lowering their bad (LDL) cholesterol levels and increasing their good (HDL) cholesterol.
Unfortunately, long-term fasting is not a feasible option for more than a few days, therefore the ketogenic diet was developed to mimic the same beneficial effects of fasting. Essentially the keto diet works by “tricking” the body into thinking it is fasting, through a strict elimination of glucose that is found in carbohydrate foods. Today the standard ketogenic diet goes by several different names, including the “no-carb diet” or “very low carbohydrate ketogenic diet”(LCKD or VLCKD for short).

If you're new to keto, watch out for hidden carbs. Generally, dairy products and nuts are a good way to meet your daily fat intake, but know that some of those items may contain more carbohydrates than you think. For example, yogurt topped with nuts may seem like a great keto-friendly snack, but a 5.3 ounce serving of plain yogurt has 12 grams of carbohydrates. Vanilla flavored yogurt has 24 grams of carbohydrates. Add an ounce of cashews, weighing in at nearly nine grams of carbs, and you’re up to 21 to 33 grams of carbs for that snack, which could knock you out of ketosis. Be sure to read nutrition labels carefully and pay careful attention to serving sizes. Track foods using a keto-specific app like Senza or KetoDiet can help you stay within your recommended daily carb intake.


Your glycogen stores can still be refilled while on a ketogenic diet. A keto diet is an excellent way to build muscle, but protein intake is crucial here. It’s suggested that if you are looking to gain mass, you should be taking in about 1.0 – 1.2g protein per lean pound of body mass. Putting muscle on may be slower on a ketogenic diet, but that’s because your total body fat is not increasing as much.5Note that in the beginning of a ketogenic diet, both endurance athletes and obese individuals see a physical performance for the first week of transition.
• 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.
Y. Wady Aude, MD; Arthur S. Agatston, MD; Francisco Lopez-Jimenez, MD, MSc; Eric H. Lieberman, MD; Marie Almon, MS, RD; Melinda Hansen, ARNP; Gerardo Rojas, MD; Gervasio A. Lamas, MD; Charles H. Hennekens, MD, DrPH, “The National Cholesterol Education Program Diet vs a Diet Lower in Carbohydrates and Higher in Protein and Monounsaturated Fat,” Arch Intern Med. 2004;164(19):2141-2146. http://archinte.jamanetwork.com/article.aspx?articleid=217514.
Bonnie J. Brehm, Randy J. Seeley, Stephen R. Daniels, and David A. D’Alessio, “A Randomized Trial Comparing a Very Low Carbohydrate Diet and a Calorie-Restricted Low Fat Diet on Body Weight and Cardiovascular Risk Factors in Healthy Women,” The Journal of Clinical Endocrinology & Metabolism: Vol 88, No 4; January 14, 2009. http://press.endocrine.org/doi/full/10.1210/jc.2002-021480.
Some people just cut out the bulk of carbohydrates from major sources like breads, pastas, and sodas, and these people are on a Low Carbohydrate plan. There isn’t anything particularly strict about it, it’s more about being mindful of overall carb intake, often without tracking. This can be a good place to test the waters of a keto diet, though many people on this kind of plan never get into ketosis without further restriction.
It truly depends from person to person. While some may be able to stay in ketosis while consuming 80 grams of carbs, others may not be so lucky. Quite a lot of people within the population can go quite high in their carbohydrate consumption and stay in ketosis, granted they have no blood sugar dysregulation. The longer you have followed the keto diet, the more your metabolism remains in ketosis after a higher carb consumption.
According to the USDA, a 100-gram serving of red tomatoes has 3.89 grams of carbohydrates.43 You may add this fruit to your ketogenic diet safely and gain its beneficial nutrients, particularly lycopene. Researchers from Ohio State University suggest that this antioxidant may help protect your skin from sun damage, which may result in a lowered risk of skin cancer tumors.44
It also interferes with some of the social aspects of food, considering how limiting it is. No cake on your birthday. No pie on Thanksgiving. No chocolate truffles on Valentine's Day. Boo to that! If you consider yourself someone who loves to eat and takes great joy in the social experience of a good meal, then the restriction of this diet may be emotionally unhealthy.
Remember the low-fat diet craze? Back in the 1990s, we were told that swapping regular cookies and chips for those labeled "low fat" would be the ticket to easy weight loss and better health. Today, it's the opposite—a low-carb, high-fat eating plan called the ketogenic diet, or keto diet for short, is getting all the buzz. Celebrities like Halle Berry, Kim Kardashian, and Megan Fox are fans; more than 7 million Instagram posts have been tagged #keto; and upwards of 1 million people search "keto diet" on Google every month.
It’s important to remember that the goal of any dietary change is to promote a healthy lifestyle, so make sure to select a meal plan you can envision yourself following long term. If you know you will not be able to comply with such stringent carbohydrate restrictions for years to come, the ketogenic diet is most likely not the right choice for you.
You should know that the side effects of a ketogenic diet are still being studied. In addition, there have not been significant studies for long term dieters.  There are plenty of people that have used the diet long term (10+ years) and very happy with it.  It is up to the unique individual, so regular checkups with your doctor are recommended to check that "everything looks good".

What is the keto diet? Rather than relying on counting calories, limiting portion sizes, resorting to extreme exercise or requiring lots of willpower (even in the face of drastically low energy levels), the ketogenic, low-carb diet takes an entirely different approach to weight loss and health improvements. It works because it changes the very “fuel source” that the body uses to stay energized: namely, from burning glucose (or sugar) to dietary fat, courtesy of keto recipes and the ketogenic diet food list items, including high-fat, low-carb diet foods.
• Keto "Flu": Your body isn't accustomed to using ketones on the regular, so when you make the switch, you tend to feel unwell. The keto diet also influences electrolyte balance, resulting in brain fog, headaches, nausea and fatigue. Keto dieters also consistently complain about getting bad-smelling breath, sweat and pee as a result of the by-product of fat metabolism (acetone) seeping out. Thankfully, this effect is just temporary, so just know you won't have to spend your life smelling rank.
There are so many vegetables that you can use, and so many ways to prepare them, that an entire book could be written on the topic. Most vegetables that grow above the ground are high in fiber, vitamins, minerals, and antioxidants. They can be added to meat dishes, cooked on their own, or eaten as a salad. Vegetables are inexpensive, easy to prepare, and can be part of every meal. Most of them are quite low in carbohydrates, so it’s hard to overindulge in this food group.

For people with diabetes, rapidly rising ketone levels can signal a health crisis that requires immediate medical attention. When there is an absence or not enough of the hormone insulin (or the body is too resistant to insulin to allow it to drive glucose into the cells for energy), the body cannot use glucose for fuel. Insulin helps ferry glucose to our cells and muscles for energy. Instead, in this case, the body resorts to burning stored fat for energy through the process of ketosis, leading to a buildup of ketones in the body.
A ketogenic diet helps control blood sugar levels. It is excellent for managing type 2 diabetes, sometimes even leading to complete reversal of the disease. This has been proven in studies. It makes perfect sense since keto lowers blood-sugar levels, reduces the need of medications and reduces the potentially negative impact of high insulin levels.
4) So, how are you feeling? Are you excited to see the numbers behind what you will be eating? You should be, because you are about to discover how you can lose weight, and still enjoy foods that taste amazing! This is going to be the last big project you complete before we get to the actual food, so head over to this post to set up My Fitness Pal Keto Diet Settings.
Basically, when you have alcohol in your body, the first thing that will be burnt is the alcohol. Only then, can your body begin to burn carbohydrates, and ultimately move on to fat-burning mode. By consuming small amounts of alcohol, the alcohol will be burnt quite fast and then move on to burning carbohydrates. The biggest tip here is to only include alcohol in your diet once your body is fully adapted to a high-fat diet.
Other forms of ketogenic diets include cyclic ketogenic diets, also known as carb cycling, and targeted ketogenic diets, which allow for adjustments to carbohydrate intake around exercise. These modifications are typically implemented by athletes looking to use the ketogenic diet to enhance performance and endurance and not by individuals specifically focused on weight loss.
If you’d like to try intermittent fasting, it’s best to start by gradually decreasing your feeding window. Start with not eating for a 12 hour stretch, including the time that you’re sleeping. For example, you could stop eating at 8 in the evening, then have breakfast at 8 in the morning. Ultimately, you’ll want to be mostly done with digestion by the time you go to bed, and not be hungry until late morning, so for most people a feeding window of 10am to 6pm would be a good goal.
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.
Remember the low-fat diet craze? Back in the 1990s, we were told that swapping regular cookies and chips for those labeled "low fat" would be the ticket to easy weight loss and better health. Today, it's the opposite—a low-carb, high-fat eating plan called the ketogenic diet, or keto diet for short, is getting all the buzz. Celebrities like Halle Berry, Kim Kardashian, and Megan Fox are fans; more than 7 million Instagram posts have been tagged #keto; and upwards of 1 million people search "keto diet" on Google every month.
Aside from the various keto-friendly foods mentioned in this article, you may be wondering if there are other options that may help support your ketogenic diet. If you find that the ketogenic diet is limiting when you start out, don't worry. There's actually a lot you can add to your diet that's "keto" as long as consumption is controlled. Here are some commonly asked questions:
The electrolyte minerals are sodium, potassium, magnesium, and calcium, and you need all four. Sports drinks are full of sugars, and only have low amounts of these minerals, so it’s best to avoid them. Instead, focus on vegetables that contain high amounts of these minerals, and make sure to salt your food to taste. You can also make an electrolyte drink that contains all of these minerals. Lite Salt or No Salt is available in the grocery store as a salt substitute, and contains potassium. Magnesium and calcium powders are available in health food stores and online.

It’s important to remember that the goal of any dietary change is to promote a healthy lifestyle, so make sure to select a meal plan you can envision yourself following long term. If you know you will not be able to comply with such stringent carbohydrate restrictions for years to come, the ketogenic diet is most likely not the right choice for you.


[i] Hussein M Dashti, MD PhD FICS FACS, Thazhumpal C Mathew, MSc PhD FRCPath, Talib Hussein, MB ChB, Sami K Asfar, MB ChB MD FRCSEd FACS, Abdulla Behbahani, MB ChB FRCS FACSI PhD FICS FACS, Mousa A Khoursheed, MB ChB FRCS FICS, Hilal M Al-Sayer, MD PhD FICS FACS, Yousef Y Bo-Abbas, MD FRCPC, and Naji S Al-Zaid, BSc PhD. "Long-term effects of a ketogenic diet in obese patients"
Although the exact role of the ketogenic diet in mental and brain disorders is unclear, there has been proof of its efficacy in patients with schizophrenia. And, to boot, the ketogenic diet works to reverse many conditions that develop as a side effect of conventional medications for brain disorders, like weight gain, type 2 diabetes and cardiovascular risks. More research is needed to understand the role of the ketogenic diet in treating or improving schizophrenia, as the current available studies are either animal studies or case studies, but the benefits of a high fat, low carbohydrate diet in neurology is promising.
Some people just cut out the bulk of carbohydrates from major sources like breads, pastas, and sodas, and these people are on a Low Carbohydrate plan. There isn’t anything particularly strict about it, it’s more about being mindful of overall carb intake, often without tracking. This can be a good place to test the waters of a keto diet, though many people on this kind of plan never get into ketosis without further restriction.
This also enables you to see what you were eating prior to a woosh of weight loss, or a stall, or even a gain. You can see possible triggers for these events, like having extra vegetables, or having too many nuts and cheeses. It also lets you see if you may have sensitivities. If you try a week without dairy but keep your calories the same, for example, you may or may not notice a spontaneous drop in weight.

When you’re first getting started, it can be helpful to use a blood or breath ketone meter.  What these meters do is measure the amount of ketones (the energy source your body is switching to) in your blood or your breath.  Knowing those amounts and seeing how they increase or decrease depending on what you’re eating daily can often be a motivating and helpful indicator of the transition occurring in your body.


This is one reason why tracking your food intake should be a priority. There are apps like Cronometer, MyFitnessPal, and LoseIt! that allow you to record all your foods for the day, and each has a large database of fresh foods, packaged foods, and restaurant meals, plus you can enter in your own recipes. This way you can know exactly what macro- and micro-nutrients you’re getting, with no guess work.
Unfortunately, long-term fasting is not a feasible option for more than a few days, therefore the ketogenic diet was developed to mimic the same beneficial effects of fasting. Essentially the keto diet works by “tricking” the body into thinking it is fasting, through a strict elimination of glucose that is found in carbohydrate foods. Today the standard ketogenic diet goes by several different names, including the “no-carb diet” or “very low carbohydrate ketogenic diet”(LCKD or VLCKD for short).
A: It's generally recommended that only 5 percent of your daily diet is allocated to carbohydrates because if you consume more than that, your body gets thrown off ketosis. However, this is only for SKD, or the standard ketogenic diet. If you're an athlete or a bodybuilder, you can consume more carbs without affecting ketosis by following a targeted ketogenic diet (TKD) or a cyclic ketogenic diet (CKD).
• Fighting inflammation — The human body can use both sugar and fat as fuel sources. However, the latter is preferred because it is a cleaner, healthier fuel that releases far fewer reactive oxygen species (ROS) and secondary free radicals. By eliminating sugar from your daily food consumption, you're decreasing your risk of developing chronic inflammation throughout your body.
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.

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A: The amount of weight you lose is entirely dependent on you. Obviously adding exercise to your regimen will speed up your weight loss. Cutting out things that are common “stall” causes is also a good thing. Artificial sweeteners, dairy, wheat products and by-products (wheat gluten, wheat flours, and anything with an identifiable wheat product in it).
The macronutrient ratios for the keto diet can range between 65-90% fat, 5-25% protein, 4-10% carbohydrates depending on the person. Those are actually pretty large ranges, so they deserve an explanation.  There are a lot of details that come into play to calculate your macros for ketosis including your current weight, target weight, exercise frequency, and more.
According to the USDA, a 100-gram serving of red tomatoes has 3.89 grams of carbohydrates.43 You may add this fruit to your ketogenic diet safely and gain its beneficial nutrients, particularly lycopene. Researchers from Ohio State University suggest that this antioxidant may help protect your skin from sun damage, which may result in a lowered risk of skin cancer tumors.44
One of the most common side effects of starting the ketogenic diet is the “keto flu.” This term describes the often unpleasant, fatigue-inducing symptoms that occur as the body adjusts from a high-carbohydrate to a low-carbohydrate diet. During the keto flu, the body’s stored glucose begins depleting, and the body starts adapting to producing and utilizing ketones as energy. (2)
The keto diet is currently being used as a safe and effective addition to the treatment of several types of cancer and can help slow tumor growth. As an example, we’d like to point to a promising study showed the intracerebral growth of the CT-2A & U87-MG tumors (related to malignant brain cancer) is significantly decreased by about 65% and 35% (27).
During week 1 (and sometimes week 2) your body is transitioning to this whole new metabolic state, and there may be some initial side effects.  These are collectively known as the "keto flu".  The good thing is that if you don't take them for granted and think you're "superman" and that your body will be different, you can easily prevent these symptoms.
Lots of apps and website offer keto diet challenges—basically, a blueprint for the keto diet with a fixed starting and ending point (they typically last for a week to a month, though some may be longer). Speaking of apps, plenty of keto-centric ones are right at your fingertips (a.k.a., your smartphone), like the KetoDiet app, which can help you calculate your macros and track your keto diet effectively.
Exogenous ketones, or ketones that are produced in a lab and then consumed, have been compared to jet fuel, both as a fuel for the brain and body, and as a flavor comparison. It’s like kick-starting ketosis, or enhancing it, since you wind up with vastly more ketone bodies in circulation with a concurrent drop in blood glucose. The best, most effective, and safest version of exogenous ketones currently available are ketone salts. They can potentially get you into ketosis faster, and help you reap the benefits of a low carb diet, but they’re still relatively new to the market (12).
• Athletic Performance Impediments: For those people who train heavy and hard, going keto might cramp your style. As important as protein is for muscle growth, carbs also play an equally critical role by releasing insulin to drive that protein into muscles faster. It also helps us build up glycogen stores for longer training sessions, runs or hikes. One comprehensive review of the literature in sports nutrition found that while research is lacking on the long-term impacts of the keto diet, in the short term, the keto diet is inferior to other diet protocols on anaerobic, aerobic and in some cases even strength performance measures.
A: It's generally recommended that only 5 percent of your daily diet is allocated to carbohydrates because if you consume more than that, your body gets thrown off ketosis. However, this is only for SKD, or the standard ketogenic diet. If you're an athlete or a bodybuilder, you can consume more carbs without affecting ketosis by following a targeted ketogenic diet (TKD) or a cyclic ketogenic diet (CKD).
Others consider the keto diet a short-term solution for weight loss. Tyler Drew, a 34-year-old real estate broker from Los Angeles, first read about the diet on Reddit and used it to lose 45 pounds in six months before returning to a traditional diet. While on the keto diet, Drew’s cholesterol levels improved, even though a typical day of eating involved bacon at both breakfast and dinner.
• Reducing appetite — Constant hunger can cause you to consume more calories than you can burn, which can eventually lead to weight gain. A ketogenic diet can help you avoid this problem because reducing carbohydrate consumption can reduce hunger symptoms. In one study, participants who were given a low-carbohydrate diet had reduced appetites, helping them lose weight easier.2
The classic ketogenic diet is a very low-carb diet plan that was originally designed in the 1920s for patients with epilepsy by researchers working at Johns Hopkins Medical Center. (1) Researchers found that fasting — avoiding consumption of all foods for a brief period of time (such as with intermittent fasting), including those that provide carbohydrates — helped reduce the amount of seizures patients suffered, in addition to having other positive effects on body fat, blood sugar, cholesterol and hunger levels. (2)
A keto diet has shown to improve triglyceride levels and cholesterol levels most associated with arterial buildup. More specifically low-carb, high-fat diets show a dramatic increase in HDL and decrease in LDL particle concentration compared to low-fat diets.3A study in the long-term effects of a ketogenic diet shows a significant reduction in cholesterol levels, body weight, and blood glucose. Read more on keto and cholesterol >

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