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Experts find clue to yo-yo dieting

Scientists may have discovered a way of identifying dieters who are prone to piling the pounds back on after weight loss. A study at Maastricht University’s Department of Human Biology found a link between a gene involved in regulating blood pressure and post-diet weight gain in women. Women who regained weight after slimming had a high change in the concentration of a particular protein in their blood during dieting, research showed. Researchers now hope to develop a test to indicate how prone people are to yo-yo dieting.

Edwin Mariman, professor of functional genetics at Maastricht, said: “It was a surprising discovery, because until now there has been no clear link between this protein and obesity. “We do not yet have an explanation for the results, but it does appear that it should be possible within a few years to use this finding to develop a test to show who is at high risk of putting weight back on after a diet.”

Hospitals already conduct tests for the protein, known as the angiotensin I converting enzyme (ACE). But the test is currently carried out to check its activity in regulating blood pressure, rather than its concentration. Up 80% of dieters suffer from the yo-yo effect, returning to their original weight within a year.

The study looked at around 100 women aged 20 to 45, half of whom had maintained their post-diet weight and half of whom had put weight back on. The findings of the research have been published by Dr Ping Wang, a scientist in Professor Mariman’s research group, in the online scientific journal PloS ONE.

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Tomato juice helps stop osteoporosis

Tomatoes are rich in cell-protecting antioxidants. Antioxidants are known cancer-fighters, such as prostate and breast cancer. And now lycopene – one of the antioxidants found in tomatoes – is being linked to reduce risk of osteoporosis. Osteoporosis is a degenerative bone disease, usually developing in old age, especially in post-menopausal women.

But the new study at the University of Toronto in Canada, says drinking tomato juice may help stave off osteoporosis. Published in the journal Osteoporosis International, scientists claim consuming 30mg of lycopene from tomato juice (about two glasses) is enough to help prevent osteoporosis. For the research, experts restricted a group of post-menopausal women, ages 50 to 60, from consuming anything containing lycopene for one month, then the study participants were split into four groups for four months. Groups were given either a 15mg lycopene supplement, a glass of tomato juice naturally containing 15mg of lycopene, a gourmet tomato juice with 35mg of lycopene, or a placebo.

After four months, results showed supplementing with lycopene raised serum lycopene, compared to the placebo group. The women consuming lycopene had significantly increased antioxidant capacity, decreased oxidative stress, and decreased bone markers for osteoporosis.

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