Carbohydrate Loading’s Effect on the Heart

A high dietary carbohydrate load is an acute metabolic challenge that could alter the heart's production of atrial natriuretic peptide (ANP).

Consuming a high-carbohydrate shake can have an acute and detrimental effect on the function of heart, says a new study.

A team of researchers from Vanderbilt and the University of Alabama at Birmingham (UAB) studied 33 individuals who were given an acute carbohydrate load in the form of a 264-kilocalorie shake. They studied the subjects' blood levels for six hours looking for many things, chief among them whether this acute metabolic challenge could alter the heart's production of atrial natriuretic peptide (ANP). ANP is a hormone that helps the body get rid of excess salt and reduces blood pressure.

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‘Carbohydrate loading alters the heart's production of atrial natriuretic peptide (ANP) hormone that eliminates excess salt and reduces blood pressure.’

Researchers know through previous studies that obese people make less ANP, predisposing them to salt retention and hypertension.

If a high dietary carbohydrate load suppresses circulating ANP concentrations, this would be a disadvantage to obese individuals who have lower ANP levels to begin with, the authors wrote in the study.

Before the participants began the study, they were normalized on a standard diet for a couple of days to remove any background dietary variability. The investigators observed that drinking the high-carb shake led to a 25 percent reduction in ANP in participants over the course of several hours.

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"The carbohydrate load had a significant and notable effect on circulating ANP levels. Experimental studies suggest that it's not good to make less ANP," said senior author Thomas Wang, M.D., chief of the Division of Cardiovascular Medicine, adding that "carb loading" may not be ideal for the body.

The investigators also looked at the mechanism for the decrease in ANP levels. They were able to reproduce the findings in mice, and found that the principal driver for the acute reduction in ANP appeared to be the increase in glucose.

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"When you take in a high-carb shake a lot of things happen, including increases in glucose and insulin. However, the increase in glucose appears to be the main thing driving the drop in ANP levels," Wang said.

UAB's Pankaj Arora, M.D., first author of the study, helped to work out the novel chemical pathways that mediated the effect of glucose on heart cells.

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This novel mechanism involved a molecule known as miR-425, which the research group has previously described as an inhibitor of ANP production. The glucose causes the cells to make more miR-425, and that, in turn, causes a reduction in ANP.

The study is published in the Journal of the American College of Cardiology.

Source-Eurekalert