Normal dietary fat contains mostly long-chain triglycerides (LCTs). Medium-chain triglycerides (MCTs) are more ketogenic than LCTs because they generate more ketones per unit of energy when metabolised. Their use allows for a diet with a lower proportion of fat and a greater proportion of protein and carbohydrate, leading to more food choices and larger portion sizes. The original MCT diet developed by Peter Huttenlocher in the 1970s derived 60% of its calories from MCT oil. Consuming that quantity of MCT oil caused abdominal cramps, diarrhea, and vomiting in some children. A figure of 45% is regarded as a balance between achieving good ketosis and minimising gastrointestinal complaints. The classical and modified MCT ketogenic diets are equally effective and differences in tolerability are not statistically significant. The MCT diet is less popular in the United States; MCT oil is more expensive than other dietary fats and is not covered by insurance companies.
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There’s also some evidence that it might help with type 2 diabetes. “An emerging body of research is finding that a keto plan may have some real benefits thanks to its ability to improve the body’s ability to use insulin and also help control appetite, which can result in easier weight loss,” says Karen Ansel, R.D.N., co-author of Healthy in a Hurry.
Run by the Charlie Foundation, this calculator can be helpful when you’re using keto as a therapy to help manage a medical condition. The calculator helps estimate calorie needs based on weight, assists in determining a macro ratio and macros needed per meal, and can calculate macro numbers on the basis of meals and snacks you enter into the system. Also takes into account fluids, supplements, and medications.
Polycystic Ovary Syndrome (PCOS) Because women with the infertility condition PCOS are at a greater risk for diabetes and obesity, some clinicians recommend the keto diet, says Taylor Moree, RD, LD, of Balance Fitness and Nutrition in Atlanta. But PCOS is no different from most health conditions mentioned here: Long-term research on the safety is needed.
As mentioned, there are a few reasons why the keto diet usually equals weight-loss gold, says Keatley. For starters, people usually reduce their daily caloric intake to about 1,500 calories a day because healthy fats and lean proteins make you feel fuller sooner—and for a longer period of time. And then there’s the fact that it takes more energy to process and burn fat and protein than carbs, so you're burning slightly more calories than you did before. Over time, this can lead to weight loss.
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The keto diet may also be beneficial for adults with epilepsy, though the Epilepsy Foundation notes that it’s less frequently recommended for this group because it is so restrictive and difficult to stick with. (1) One study, published in May 2016 in the journal Epilepsy & Behavior, found the diet reduced the frequency of seizures for many study participants, 7 percent of whom were seizure-free at the four-year mark. (2) And though it wasn’t the goal for this study, nearly 20 percent of the participants lost weight while following the diet.
The possible benefits of the diet are impressive, but there are a few potential downsides to note. One is it’s tough to stick to. In fact, in a review of 11 studies involving adults on the keto diet, which was published in January 2015 in the Journal of Clinical Neurology, researchers calculated a 45 percent compliance rate among participants following the approach with the aim of controlling epilepsy. (13) “The diet is pretty hard to follow because it’s a complete shift from what you’re used to,” Nisevich Bede says. Slashing your intake of carbs can also make you feel hungrier than usual — a feeling that can last until you’re three weeks in.
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