(Agencies)
Updated: 2007-12-11 10:19

It asked about Mormons' religious practices: monthly fasting; avoiding tea, coffee and alcohol; taking a weekly day of rest; going to church, and donating time or money to charity.

Among the 515 people surveyed, only fasting made a significant difference in heart risks: 59 percent of periodic meal skippers were diagnosed with heart disease versus 67 percent of the others.

The difference persisted even when researchers took weight, age and conditions like diabetes or high cholesterol or blood pressure into account. About 8 percent of those surveyed were not Mormons, and those who regularly fasted had lower rates of heart disease, too.

Horne speculated that when people take a break from food, it forces the body to dip into fat reserves to burn calories. It also keeps the body from being constantly exposed to sugar and having to make insulin to metabolize it. When people develop diabetes, insulin-producing cells become less sensitive to cues from eating, so fasting may provide brief rests that resensitize these cells and make them work better, he said.

But he and other doctors cautioned that skipping meals is not advised for diabetics — it could cause dangerous swings in blood sugar.

Also for dieters, "the news is not as good as you might think" on fasting, said Dr. Raymond Gibbons of the Mayo Clinic, a former heart association president.

"Fasting resets the metabolic rate," slowing it down to adjust to less food and forcing the body to store calories as soon as people resume eating, Gibbons said.

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