Fasting may help lower high blood pressure by changing the body’s metabolism, according to researchers from Pantox Laboratories.
They propose that going without food for a controlled period could interrupt biological cycles that help keep blood pressure too high.
High blood pressure, also called hypertension, is extremely common and is a major risk factor for heart attack, stroke, kidney disease and other serious health problems. It often develops without obvious symptoms, which is why regular blood pressure checks are important.
Eating too much salt is one well-known cause of high blood pressure. Salt contains sodium, which can make the body hold extra water and can increase pressure inside blood vessels.
However, reducing salt does not always produce a large drop in blood pressure. The researchers suggest that salt may work together with other features of a modern diet and metabolism, creating cycles that continue to push blood pressure upward.
One possible player is insulin, a hormone best known for helping control blood sugar. Insulin levels normally rise after eating, especially after meals containing carbohydrates, and the hormone can also affect the kidneys, nervous system and blood vessels.
The researchers argue that repeatedly high insulin levels may help maintain conditions that promote hypertension in some people. Fasting sharply reduces the need for insulin because no food is entering the body.
During a fast, the body gradually switches from using recently eaten food for energy to using stored energy. Insulin levels fall, and changes occur in the way the body handles salt, water and fuel.
According to the researchers, these changes may help break metabolic cycles that keep blood pressure high. In this view, fasting would act as a temporary metabolic reset rather than simply as another way to reduce calories.
Previous studies have reported large falls in blood pressure among people completing medically supervised water-only fasts. Some programs have followed the fasting period with a low-fat, low-salt diet based mainly on whole plant foods.
Importantly, some participants have maintained lower blood pressure after they began eating again. The researchers believe the follow-up diet may help prevent the harmful metabolic cycle from becoming established again.
This raises the possibility that fasting followed by major dietary changes could have longer-lasting effects than either strategy alone. However, describing the approach as a cure for hypertension would require much stronger evidence from large, carefully controlled studies.
Complete water-only fasting is also difficult and can carry risks. Long fasts can cause dehydration, dizziness, low blood pressure, changes in body salts and other problems, particularly in people taking blood pressure or diabetes medicines.
The researchers therefore discuss another possibility called a protein-sparing modified fast. This approach provides a limited amount of protein while sharply reducing other sources of energy, with the aim of limiting muscle loss.
If future studies show that this modified approach produces similar metabolic effects, it could potentially be easier to use than complete fasting. Researchers would still need to establish who could safely use it and how it should be supervised.
The idea may have implications beyond high blood pressure. The researchers suggest that fasting could potentially interrupt unhealthy metabolic patterns involved in conditions such as type 2 diabetes and some immune-related diseases.
That possibility remains uncertain. Different diseases have very different causes, and evidence that fasting changes a biological marker does not automatically mean it can reverse a disease.
The research therefore offers an interesting theory rather than a reason for people with hypertension to stop their medication and begin fasting on their own. Blood pressure drugs have strong evidence behind them, and suddenly changing treatment can be dangerous.
People interested in fasting should also remember that blood pressure can fall during a fast. Someone already taking medicines that lower blood pressure or blood sugar may need medical monitoring because the combination could cause levels to drop too far.
Overall, the research highlights a growing interest in how meal timing and periods without food affect metabolism. It suggests that the benefits of fasting may involve more than weight loss and could include changes in insulin, fluid balance and the body’s response to food.
More clinical trials are needed to determine whether fasting provides benefits beyond those produced by weight loss and a healthier diet, how long any improvements last, and which patients are most likely to benefit. Until those questions are answered, medically supervised fasting should be viewed as an experimental approach rather than a proven replacement for standard hypertension treatment.
The research was published as a scientific proposal examining therapeutic fasting and the metabolic processes that may contribute to hypertension.
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