In the first week, many people report headaches, mental fogginess, dizziness, and aggravation. Most of the time, this is the result of your electrolytes being flushed out, as ketosis has a diuretic effect. Make sure you drink plenty of water and keep your sodium intake up.6One of the fathers of keto, Dr. Phinney, shows that electrolyte levels (especially sodium) can become unbalanced with low carb intake.

Test for allergies and intolerances. For suspected allergies and intolerances, It is best to try an allergy test and an elimination diet that removes all common allergens and intolerances (wheat, eggs, fish, dairy, nuts, peanuts, shellfish, soy, and nightshade vegetables) for a period of time (3-4 weeks). If you are noticing positive changes and want to start adding these foods back into your diet, choose one at a time and tread slowly. Take note of how you feel. If you are still feeling great, move onto the next one. If at any time you experience adverse reactions to a certain food, chances are you have an allergy or intolerance to it.
Ben Tzeel is a Registered Dietitian and Certified Strength and Conditioning Specialist (CSCS), holding a Masters in Nutrition from the University of North Carolina at Chapel Hill.Ben has lived with Type 1 Diabetes since 1999 and has never allowed it to hold him back from achieving his goals. He is a published fitness model and author who writes about exercise, nutrition, and diabetes.
He was wrong. Originally used for epilepsy, studies show that keto diets are far from dangerous. In fact, they benefit numerous conditions, including cancer, dementia, and overweight/obesity, and modern history only supports these claims. During the early 19th century, physicians had dramatic success implementing keto diets, yet they eventually found that prescribing drugs was much easier that than scrupulously monitoring what people ate. (1) 
The counter-argument is that diabetes is not reversed because it will come back soon after starting to eat lots of sugar and refined carbs. How much time is soon? It is difficult to say how “soon” diabetes will come back, and the time it takes depends on many factors. It is, however, true that the ketogenic diet does not set the body back to zero and allows for another few decades of unhealthy eating. On the other hand: every adult with a high sugar/high carb history has a high risk of becoming diabetic. It is just a matter of time.
But your heart health might depend on what you actually eat. Research published in the New England Journal of Medicine suggests that low-carb diets based mostly on plant sources of fat and protein (like avocados or nuts) can lower heart disease risk by 30 percent. But those benefits didn’t hold for people who ate mostly animal-based proteins and fats. (Think: bacon, butter, and steak.)
Early research suggests that the keto diet may slow the growth of cancerous tumors. “Cancer cells have plenty of insulin receptors on them, making them flourish in environments high in blood sugar and insulin,” says Brandon Olin, host of The Deskbound Podcast, which focuses on overcoming the damage of a sedentary lifestyle. “It’s essentially giving cancer cells a source of fuel to feed on and grow.” The research suggests ketone bodies may provide energy for your body without feeding the tumors.

Finally, wait it out. Certain folks who do everything by the book and follow every bit of good advice may still get a few symptoms of the keto flu. This usually comes in the initial three weeks of entering nutritional ketosis, and things get much better very quickly. Trust that your lull will pass and your energy will increase substantially—usually within a few days.
While many of the problems that develop with prolonged ketosis may be addressed simply by minding intake of prebiotic fibers, not all are, such as selenium deficiency and stunted growth. (Note that the ideal intake of prebiotic fibers, the level we aim for in Wheat Belly and Undoctored programs, is 20 or more grams per day.) Some have argued that higher beta-hydroxybutyrate ketone levels that develop with a ketogenic diet is all you need to do to maintain healthy bowel flora, but this is a huge extrapolation that does not make sense in light of the newest insights into the microbiome and its metabolites. It ignores the role of hundreds of other microbial metabolites that are required and/or produced that are changed with prolonged deprivation of prebiotic fibers. Also, some have blamed the adverse long-term effects in kids on the seizure medications they take, but the side-effects of, say, drugs such as tegretol, valproic acid, or topiramate do not include the above phenomena.
Adding salt to food might be new to you, since most people are used to being told to limit salt intake. However, when you’re eating a ketogenic diet of less than 60 carbohydrates each day, you’ll need to make up for this loss of salt. That being said, those with high blood pressure who take medication should check with their doctors before making a change.
After your body enters this carb-deficient state, it begins burning fat to provide energy, and this burning of fat causes a release of ketones. Ketones are dense sources of energy that can stimulate critical parts of the body, such as the brain. By drastically shifting your diet from carbohydrate dependence to fat dependence, you can enjoy a number of impressive health benefits, in addition to weight loss.
He was wrong. Originally used for epilepsy, studies show that keto diets are far from dangerous. In fact, they benefit numerous conditions, including cancer, dementia, and overweight/obesity, and modern history only supports these claims. During the early 19th century, physicians had dramatic success implementing keto diets, yet they eventually found that prescribing drugs was much easier that than scrupulously monitoring what people ate. (1) 
Ketones are more beneficial to the brain than glucose is.  This is great news for patients with Type 1 Diabetes, because it will not affect the brain function when you are running low in glucose. Ketosis prevent raising blood glucose levels, since you are not introducing large amounts of carbs into your system. They help in stimulating the growth of healthy brain cells.

Holy cow Batman i started keto diet on the 9th of January within 4 days I was no longer on bydureon (weekly insulin) levemir 60units 2x daily and no more Novolog 25 units3x daily all that and metformin 10002x and this all didn’t have my sugars under control amazingly keto diet got sugars in check within four days I’ve been on diet now for 15 days and have honestly never fealt better I’m still green on diet and have had some issues while my body is healing itself (keto flu,low electrolytes very sluggish) .. My aunties actually have been on diet for a year now and were the ones that referred me to it after seeing there transformation i was on Board I’m having my first cheat day cause it’s my bday and other family members haven’t and don’t need the diet so I eat what they make a couple times a year this diet had been literally a life saver to me I’m down to my metformin 2x a day and sugars are at 90-140 depending on when I test after/before a meal with all the meds sugars haven’t been under 200 for the last two years so woot woot to Keto I’ll keep y’all posted thanks for the article my doctor is concerned about ketoacidosis so she’s not on Board and I need forums like this to help me move forward
So yes, the ketogenic diet is safe for diabetics. However, they still need to be closely monitored because diabetes medications including insulin, blood pressure, and beta blockers will have to be adjusted down when following a ketogenic diet. Therefore, the diabetic should do this with supervision from a doctor who is up to date with the nutritional literature.
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