What we do know, based on carefully conducted laboratory testing of overweight men, is that going keto probably doesn't help burn more body fat than a regular regimen. Instead, it forces people to dramatically curb their sugar intake (remember, sugar is 100% carbohydrate) and kick processed foods to the curb. Those are both good habits for overall health and blood-sugar levels, and they can help reduce your likelihood of developing cancer.
I get asked this question a lot. Generally speaking, the answer is no. As long as you avoid vegetables like corn, beets, and carrots, which are high in starch and sugar, especially carrot JUICE, which is packed with sugar, for example, you don't have to worry about the vegetable family. In fact, you want to eat lots of green leafy vegetables, cruciferous vegetables, Brussel sprouts—make big kale salads with bacon bits and a full fat dressing. Or make a big beet green sauté in coconut oil with some bacon, garlic, and onion stirred in. These will be dishes PACKED with potassium which will quiet food cravings much like fat does. Often, food cravings are nothing more than your body crying out for NUTRIENTS and MINERALS you’re not giving it. Your body doesn’t really want chips and sugar—it wants more potassium, magnesium, vitamin A, K2, and B vitamins.
In terms of weight loss, you may be interested in trying the ketogenic diet because you’ve heard that it can make a big impact right away. And that’s true. “Ketogenic diets will cause you to lose weight within the first week,” says Mattinson. She explains that your body will first use up all of its glycogen stores (the storage form of carbohydrate). With depleted glycogen, you’ll drop water weight. While it can be motivating to see the number on the scale go down (often dramatically), do keep in mind that most of this is water loss initially.

Another common mistake that she sees is that people focus too much on macronutrients: "Micronutrients are really important too as ketosis is metabolically demanding and the diet is not nutritionally adequate most of the time." She says that most of her clients take multivitamins, carnitine supplements, calcium supplements and sometimes selenium or zinc.
The low glycaemic index treatment (LGIT)[48] is an attempt to achieve the stable blood glucose levels seen in children on the classic ketogenic diet while using a much less restrictive regimen. The hypothesis is that stable blood glucose may be one of the mechanisms of action involved in the ketogenic diet,[9] which occurs because the absorption of the limited carbohydrates is slowed by the high fat content.[5] Although it is also a high-fat diet (with approximately 60% calories from fat),[5] the LGIT allows more carbohydrate than either the classic ketogenic diet or the modified Atkins diet, approximately 40–60 g per day.[3] However, the types of carbohydrates consumed are restricted to those that have a glycaemic index lower than 50. Like the modified Atkins diet, the LGIT is initiated and maintained at outpatient clinics and does not require precise weighing of food or intensive dietitian support. Both are offered at most centres that run ketogenic diet programmes, and in some centres they are often the primary dietary therapy for adolescents.[9]

Keep in mind that the doctor is getting nutritional ketosis confused with a much more dangerous condition called ketoacidosis. These are two different conditions.  Ketoacidosis is mostly  a concern for Type 1 diabetics and others whose bodies are unable to make or process insulin correctly. Ketoacidosis usually develops when a person with type 1 diabetes develops an serious infection, has a heart attack or other debilitating illness. It is accompanied by dehydration, high blood sugars and is precipitated by the inability of the sick patient to administer proper amounts of injected insulin.
Achieving ketosis is a pretty straightforward, but it can seem complicated and confusing with all of the information out there.4If you want to learn more about ketosis and the scientific process around it, you can visit a very in-depth discussion about on Dr. Peter Attia’s website. Here’s the bottom line on what you need to do, ordered in levels of importance: