Let’s talk about a keto side effect that may not be so sexy: constipation. “Many of the richest sources of fiber, like beans, fruit, and whole grains are restricted on the ketogenic diet,” says Clark. “As a result, ketogenic eaters miss out on the benefits of fiber-rich diet such as regular laxation and microbiome support. The microbiome has been implicated in everything from immune function to mental health.” Indeed, in a long-term study in the Journal of Pediatrics in April 2015, constipation was noted as a very common side effect in children receiving ketogenic diets for epilepsy treatment.
The keto diet works for such a high percentage of people because it targets several key, underlying causes of weight gain — including hormonal imbalances, especially insulin resistance coupled with high blood sugar levels, and the cycle of restricting and “binging” on empty calories due to hunger that so many dieters struggle with. In fact, these are some of the direct benefits of the keto diet.
The research on ketogenic diets also suggests you'll need to take a multivitamin to get enough minerals, calcium and vitamin D — most of which are readily available in plant-based foods. One keto-specific example: Not getting enough selenium, an immune-boosting antioxidant found in plant foods, can cause cardiomyopathy, a hardening of the heart muscle leading to heart failure.
What is diabetic ketoacidosis? When a diabetic (usually a Type I diabetic, but sometimes this occurs in very late-stage, insulin-dependent, Type II diabetics) fails to receive enough insulin, they go into an effective state of starvation.  While they may have all the glucose in the world in their bloodstream, without insulin, they can’t get any into their cells.  Hence, they are effectively going into starvation.  The body does what it would do in anyone – it starts to make ketones out of fat and proteins.  Here’s the problem: the diabetic patient in this case can’t produce any insulin, so there is no feedback loop and they continue to produce more and more ketones without stopping.  By the time ketone levels (specifically, beta-hydroxybutyrate) approach 15 to 25 mM, the resulting pH imbalance leads to profound metabolic derangement and the patient is critically ill.
Cyrus Khambatta earned a PhD in Nutritional Biochemistry from UC Berkeley after being diagnosed with type 1 diabetes in his senior year of college at Stanford University in 2002. He is an internationally recognized nutrition and fitness coach for people living with type 1, type 1.5, prediabetes and type 2 diabetes, and has helped hundreds of people around the world achieve exceptional insulin sensitivity by adopting low-fat, plant-based whole foods nutrition.
By cutting carbs, you’ll also cut sugar and simple, refined carbohydrates, which means a steadier supply of energy. (No more sugar highs and crashes!) Once their bodies are used to the diet, “The first thing people report is, ‘Oh my gosh, I have this steady energy and I don’t have the need to snack at 3 p.m. because my energy is waning,’” Nisevich Bede says. Research published in January 2015 in the journal Obesity Review showed that the keto diet may lead to fewer hunger pangs and a lower desire to eat. (3)
I am a 7 year stroke survivor that is partially paralyzed from the stroke. I work part time and while working I walk at least 2 miles at work three to five times per week, but I can only walk 1 mph if even that speed. Which I know average speed is 3 mph when walking. I am 40 pounds overweight due to not being to do cardio workouts. I take aspirin daily as a blood thinner. I have considered getting on the keto diet. I drink sweet tea and one dr pepper per day along with coffee and water. I talked to my dr about this diet all he could tell me was he hasn’t researched it enough but knew of someone that lost weight on it. For my health I need to maintain a healthy weight and not be overweight. I have a b12 deficiency along with folic acid. I have not been taking any supplements for either.
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