Ketogenic Diet

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14 November 2017Ketogenic Diet

14 November 2017Ketogenic Diet

What is the Ketogenic Diet?

The ketogenic diet is a rather recent entry on the weight loss scene, but it has been around for much longer. Hundreds of years ago, people recognized that fasting helped control seizures, such as from epilepsy. But fasting isn’t a realistic long-term solution. Eventually the ketogenic diet evolved, to mimic some metabolic aspects of fasting. It’s still used, especially for children who do not respond well to anticonvulsant medications. One undesirable side effect of the diet on children is weight loss. Careful attention must be paid to children on this diet to be sure they maintain enough food intake to support growth and maintain weight. It’s that undesirable side effect that brought the ketogenic diet to the attention of dieters. Now it’s promoted as a miracle cure for obesity.

This extremely restrictive diet creates a metabolic state called ketosis. Severe carbohydrate restriction shifts metabolism to fat burning for energy needs. People with Type 1 diabetes are familiar with ketosis, as it signals insufficient insulin and poor glucose control, forcing fat metabolism for energy needs. The by-products of so much fat metabolism are ketones, which are quickly flushed out by the kidneys to prevent toxic build-up. One other side effect: appetite suppression, a benefit for dieters. You end up eating fewer calories than you need, and the deficit leads to weight loss, as fat is preferentially burned for energy needs.

The ketogenic diet is extremely restrictive, to push metabolism into ketosis. As a percent of calories, the diet is:

  • 75% fat
  • 20% protein
  • 5% carbohydrate

All typical carbohydrate foods are prohibited, aside from certain green vegetables in small amounts.

Contrary to popular belief this is not a high protein diet. At 20% of calories, protein is actually limited to a modest amount. For example, for a 1600 calorie daily intake, protein would be 80 grams, or about 25 – 30 grams for each of 3 meals. That’s roughly a 4 oz portion of meat, not a giant steak. And the protein must be restricted that way to make room for the required fat intake.

The permitted food list is very specific, and most of the foods are high-fat:

  • Cream
  • Full-fat cheeses
  • Cream cheese
  • Sour cream
  • Eggs
  • High fat red meat, poultry or fish
  • Bacon
  • Vegetable oils
  • Avocado
  • Nut butter and nuts, in restricted amounts, due to the carbohydrate content

Very small amounts of watery, low-carb vegetables like greens, broccoli, mushrooms, cucumbers, peppers, zucchini, tomato and broccoli are permitted.

Carbs need to be counted to keep the number at 5% of calories. The 1600 calorie diet would allow for 20 grams of carbs. If you ate 2 tablespoons of peanut butter, which has carbs, you could add 1/2 an avocado and 1 cup cooked spinach. That’s it for carbs. All of your other foods would have to come from the list above.


  • The obvious benefit for dieters is that, if you stick with the diet long enough, you go into ketosis and start burning more fat, and losing weight. Ketosis takes some time to develop; you don’t go into that state on Day 1 or even Day 3 of the diet. Ketostix can be used to test your urine for ketones; some keto diet plans advise this testing to monitor ketosis.
  • Hunger suppression is a clear benefit for dieters who find it hard to stick to standard low calorie diets.
  • If you are obese and at risk for Type 2 diabetes, hypertension or heart disease, and you do lose significant weight, your risk decreases accordingly. Even despite the extremely high-fat intake.


There are several significant problems with this diet:

  • Nutrient imbalances: the diet is unbalanced, lacking in many nutrients. Potential problem nutrients are:




    Vitamin C

    Vitamin A

    Vitamin D

    B vitamins


    Carotenoids and antioxidants


    For that reason alone, it should not be considered a long-term diet. Sure, you can take a multiple vitamin and some mineral supplements, but no supplement can replace naturally occurring plant fiber, antioxidants, polyphenols, probiotics and prebiotics. For example, you could take a probiotic supplement, but with nothing to live on, those expensive probiotic bacteria will simply die off.
  • Extreme food restrictions. The extremely restrictive nature of this diet makes it difficult if not impossible to have a social life. You cannot eat meals normally served in restaurants or at other people’s homes. It can be very isolating, as you’ll need to prepare all your meals and snacks at home.
  • Body odor. Ketones, the by-products of ketosis, are the same chemicals used in nail polish remover. In fact, one sign of diabetic ketoacidosis is breath that smells like nail polish remover. If you are not around people much, this may not be a concern. Some couples go on the diet together, making meal preparation and any odor issues less burdensome.
  • Boredom. All that fatty food, day after day after day gets old. No crunch or refreshing flavor of fruit, not to mention all the foods people enjoy on a daily basis, from oatmeal to pizza. All off limits. How much sour cream or avocado can you stand?
  • Transitioning back to normal food. Few people would keep up a ketogenic diet indefinitely, because of the boredom and social isolation, if not the nutritional problems. But at the moment, there is little agreement on how to transition back to a more normal food intake. Adding carbs back will inevitably change metabolism, resulting in some apparent weight regain, mostly water weight associated with glycogen. That can be discouraging.
  • As with any extremely restrictive diet, the tendency is to go overboard and treat yourself to all the foods you’ve been missing for so long. In which case you might find yourself regaining more than just a few pounds of water weight. If you go back to your previous obesity-promoting ways, you’ll regain all the weight. Not a good plan. So you need some structure to your return to normal food. And you might want to consider long-term restriction of junky processed foods that just trigger overeating.
  • Complications for existing medical conditions: No one with an existing medical condition should start this diet without first consulting a physician. People with diabetes who take insulin (or any medication with a high risk for hypoglycemia) need to discuss safety issues with their physician before starting this plan. There are some reports of loss of menstrual periods and possible infertility in women who follow this diet. However, there is no solid evidence that this is caused by the ketogenic diet as opposed to the caloric restriction and weight loss. If you follow this diet and develop amenorrhea, you should stop and consult a medical provider.


A ketogenic diet isn’t going to cost that much more or less than your normal groceries. You aren’t expected to purchase special branded meals or products. All foods are available at any supermarket. Working with a registered dietitian on diet planning and follow up would add modestly to the overall cost.

Social Support

There is no organized ketogenic diet organization to provide support or advice. There are websites, many of which are set up to sell you products. You might find grass-roots support groups in certain places, but there is nothing official. If you do not work with a medical professional, you’ll be on your own to find information and prepare food.


Does it work?

Yes it works if you successfully transition to ketosis and stick with the diet long enough to lose weight.

Who would most benefit from this diet?

Obese people who have not had good success sticking to simple low calorie diets with more liberal food choices might do well with these very clear restrictions. Sometimes people are relieved to just have a simple list of what they can eat, omitting choice from the weight loss equation. Also, people who are motivated by seeing the number on the scale go down more quickly than a pound per week might like this diet. So in general, people who are motivated by results and who do better with less choice, and who don’t mind the socially isolating nature of this diet might benefit.

Is it viable long term?

No, it is not. It’s nutritionally unbalanced and supplements cannot make up for all those deficiencies. Since weight loss is a new application for this diet, and few people stick to it long term, there is little data on what a ketogenic diet might mean for future health.

Do I like this diet?

I wouldn’t go on a ketogenic diet myself, but I realize many obese people have found weight loss success with it. My advice is to work with a professional who understands the health implications of the diet and can help you successfully transition off of it after your weight goals are achieved.


Ketogenic diets are now being used for other brain diseases. The Charlie Foundation provides information about ketogenic therapy for seizures, and the website has recipes and information that would be useful to people on ketogenic diets for weight loss.

Medical News Today has some facts on ketosis.

Here is a lengthy scientific review of ketogenic diets for weight loss from the National Library of Medicine.

14 November 2017Ketogenic Diet

Donna P Feldman MS RDN

is author of “Feed Your Vegetarian Teen”, writes about food and nutrition at Radio Nutrition and is co-host of the Walk Talk Nutrition podcast series.

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Disclaimer: The information provided here does not constitute medical advice.
If you are seeking medical advice, please visit your healthcare provider or medical professional.


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