The ketogenic diet is often promoted for a long list of health benefits.
The scientific evidence is more specific.
One of the clearest metabolic effects is a reduction in triglycerides.
Ketogenic diets can also support weight loss. For people with overweight or obesity, reducing excess body weight can improve several aspects of metabolic health.
Another potential benefit is better blood glucose control.
In some populations, ketogenic diets have reduced HbA1c, a marker reflecting average blood glucose over the preceding months.
There is also an established medical use that is quite different from weight management.
Ketogenic diets have been used for many years in the treatment of epilepsy, particularly when seizures are difficult to control. Evidence supports their ability to reduce seizure frequency in appropriate patients under medical supervision.
But these benefits should be kept in perspective.
Not every reported effect of keto is supported by equally strong evidence. Different ketogenic diets have also been studied in very different groups of people.
A benefit seen in someone with obesity, diabetes or epilepsy cannot automatically be assumed to occur in a healthy adult.
And improvements in short-term metabolic markers do not yet tell us whether keto improves health over decades.
The strongest approach is therefore to identify why the diet is being used and which health outcome we are trying to improve.
