Why the ketogenic diet lowers blood pressure in some users but not others, researchers explain

A growing body of research suggests that the ketogenic diet can influence blood pressure, though the response varies widely from person to person. Scientists studying the high-fat, low-carbohydrate eating pattern say the variability likely reflects differences in metabolism, baseline health, and how strictly individuals follow the diet.

How ketosis may affect cardiovascular markers

The ketogenic diet shifts the body into a metabolic state called ketosis, in which fat is broken down into ketones for energy instead of glucose. Researchers note that this switch can lead to weight loss and improved insulin sensitivity, both of which are linked to lower blood pressure. Reduced carbohydrate intake may also decrease sodium retention, contributing to a mild drop in readings.

However, the same dietary pattern can raise LDL cholesterol in some people, a change cardiologists flag as a potential concern for long-term cardiovascular health.

Why responses differ between individuals

Experts point to several factors that may explain why blood pressure improves for some followers of the diet but not others:

• Starting body weight and body composition, which influence how much blood pressure drops as weight is lost.
• Baseline insulin levels, since people with insulin resistance may see larger improvements.
• Duration and adherence, with stricter carbohydrate restriction generally producing stronger effects.
• Genetic differences in how the body metabolises fats and salts.

What the evidence suggests

Clinical studies have produced mixed results, with some trials showing meaningful reductions in systolic and diastolic pressure after several weeks on a ketogenic plan, while others report no significant change. Researchers caution that the diet is not a one-size-fits-all intervention and recommend that anyone with hypertension consult a clinician before making major dietary changes. For a closer look at related dietary research, readers can explore findings on short-term vegan diets and gene activity and caution from dietitians about trending grapefruit diets. Additional context on weight-management products is available in this overview of seven supplements marketed for obesity support.