If you have high blood pressure, you more than likely have been told to try to lose weight and to reduce your sodium intake. But have you ever been told to reduce your sugar and starch intake? More than likely you haven’t. In fact, some people in the medical community believe that it’s a myth that high carb intake can contribute to insulin resistance and high blood pressure. What a disappointment.

Many studies over the last decade have shown improvements in blood pressure as a byproduct of low carb diets. However, not many studies have looked specifically at blood pressure as an endpoint on a low carb diet. One study completed in 2003 and reported to the American Association of Clinical Endocrinologists in 2006, found that changing the diet to reduce insulin secretion resulted in a drop in diastolic blood pressure (the lower number) from 96 to 88.5 mmHg after six weeks.^1-2

The diet used in this study was a low carb, high fat and animal protein diet. The only dietary restriction was sugar and starch, the two food groups that elicit the highest insulin secretion. There was no calorie or sodium restriction on the diet.

Although the study’s lead researcher stated that they discouraged the participants from consuming too many high sodium processed meats like hot dogs and bacon, some participants ignored that advice and in so doing were consuming as many as 20 grams of sodium per day. (Current medical guidelines are to try to eat no more than 2.3 grams [2300 mg] of sodium per day.)

Despite increased sodium intake, blood pressure came down, and that’s not the only thing. Fasting blood glucose and insulin, triglycerides, and VLDL all came down — and there was an average of 12 pounds of weight loss. And finally, there were positive effects on LDL — the particle size increased. (Larger particle size LDL is not as likely to become plaque in the arteries as small particle LDL.)

Participants were all patients who were overweight, had elevated blood pressure and blood sugar, and were considered to be at very high risk for heart disease and strokes. By the end of the six weeks, some patients were able to stop their high blood pressure and blood sugar medications altogether, and others were able to reduce their dosages.

This finding led the authors to conclude that medicine needs to stop paying so much attention to sodium and more attention to insulin as the cause of high blood pressure. You would think that news like this would travel fast, yet I have found that almost no one has heard of it.

Those of you who regularly read my husband Jim’s and my articles, know that we are big advocates for low carb diets. I just want you to know that in reducing your carb intake, you are not only choosing a diet that is good for your weight, your lipids, and blood sugar, you are benefiting from one of the most powerful ways to reduce blood pressure as well. And by making that change you don’t need to be nearly as strict with the salt shaker.

References

1. Abdul-Rahman, M et al. Abstract 201, Endocr Pract. 2006; 12(Suppl. 2), 50.
2. Hays JH et al. Mayo Clin Proc. 2003:78; 1331-1336.

[Ed. Note: Laura B. LaValle, RD, LD is presently the director of dietetics nutrition at LaValle Metabolic Institute (formerly part of Living Longer Institute). She offers personal nutritional counseling at LMI for clients who need help with their diet in relation to illness or disease. Laura also provides educational services in the areas of health promotion, wellness, and disease prevention. To learn more, click here.]