There are three instances where there’s research to back up a ketogenic diet, including to help control type 2 diabetes, as part of epilepsy treatment, or for weight loss, says Mattinson. “In terms of diabetes, there is some promising research showing that the ketogenic diet may improve glycemic control. It may cause a reduction in A1C — a key test for diabetes that measures a person’s average blood sugar control over two to three months — something that may help you reduce medication use,” she says.
A study published in American Psychologist found that short-term dieting involving "severe restriction of calorie intake" does not lead to "sustained improvements in weight and health for the majority of individuals".[4] Other studies have found that the average individual maintains some weight loss after dieting.[5] Weight loss by dieting, while of benefit to those classified as unhealthy, may slightly increase the mortality rate for individuals who are otherwise healthy.[6][7][8]
These types of back-and-forth weight fluctuations can contribute to disordered eating, Kizer says, or can worsen an already unhealthy relationship with food. “I think this diet appeals to people who have issues with portion control and with binge eating,” she says. "And in many cases, what they really need is a lifestyle coach or a professional counselor to help them get to the bottom of those issues."

"Protein is great for fat loss. It helps build and preserve lean muscle tissue and can increase the amount of calories you burn. It’s also a great source of energy that helps you feel fuller for longer, so you’re less tempted to snack. Good sources include chicken breast, tuna, eggs, milk and chickpeas. And if you’re finding it difficult to avoid snacks that are high in carbohydrates, try substituting them for protein shakes or bars. Remember also to opt for the lean sources of protein because some sources can be high in saturated fat."
Again, there’s an easy short answer: Yes. By drastically limiting your calorie intake, your body is burning more than it’s taking in, and you’ll shed pounds quickly, possibly even that 10 pounds in one week that others who've tried the diet have claimed. However, the diet itself is only designed to last one week. If you're looking to get a jump start on your weight loss journey, it can be a good place to begin. But if you're looking to make healthy changes in your life, longer-term solutions might be the better fit.
I've learned that if I am around food for long enough, I will eat it. It doesn’t matter if I am hungry or if the food even looks good; I'll just start nibbling out of habit. When my husband would get home late from work, I would typically eat a dinner by myself and then eat more with him when he got home. I tried to sit with him at the table and not eat, but eventually, I would start picking at his plate. Over time, I realized that I needed to sit either across the table or on a nearby couch to avoid the thoughtless habit. He didn’t mind either way and moving away from the food actually allowed me to focus more on him.
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