Weight loss by diet shakes is temporary: Experts - Pakistan Observer
The Dietitians Association of Australia said 95 percent of all dieters would regain their lost weight in one to five years.
Weight Watchers' nutritionist Emma Stirling said the key concern for many health professionals is that meal replacement shakes are a temporary fix. "Contrary to popular belief, there is no miracle weight-loss cure or proven fat-blasting ingredients lurking within a chocolate diet shake," the Sydney Morning Herald quoted her as saying.
"They are simply a combination of vitamins, minerals and other additives in a flavoured milk or water-based drink. "Diet shakes are designed to be partial meal replacements, where one or two meals a day are replaced with the shake and the remaining meals made up of regular food," she explained.
She said that eating a couple of small pieces of fruit instead of a couple of meals a day would create the same loss of calories.
Dr Ken Harvey, senior research fellow at La Trobe University""s School of Public Health, said his main concern with the diet shake industry was the unsubstantiated miracle weight-loss claims being made by several companies.
He filed a complaint to the Therapeutic Goods Administration""s complaints resolution panel about Pharmacare Laboratories' Xantrax shakes after the company claimed that """a new slimmer you is less than 30 days away - with the doctor-recommended diet shakes".
Meanwhile scientists at Aberdeen's Rowett Research Institute have shown that a high protein, low carbohydrate diet is most effective at reducing hunger and promoting weight loss, at least in the short term.
Healthy, obese men were given two different diets during their stay in the Rowett's specialised Human Nutrition Unit. Both diets had a high protein content (30% of total energy value of the diet) but they differed in the amount of carbohydrate: One diet was low in carbohydrate (4%) and the other contained a moderate amount of carbohydrate (35% total energy value). "Our volunteers found both diets to be equally palatable, but they felt less hungry on the high-protein low-carbohydrate diet compared with the diet which contained high-protein but moderate amounts of carbohydrate," said Dr Alex Johnstone, the Rowett's weight-loss expert who led the study. "Weight loss during the two four week study periods was greater on the high-protein low-carbohydrate diet, averaging 6.3 kg per person, compared with 4.3 kg on the moderate carbohydrate diet," said Dr Johnstone.
An important part of this study was to unravel the physiological mechanisms behind this type of diet. It is known that when people eat low carbohydrate diets, within a relatively short time their body has to switch from using glucose as a fuel to using something different called ketone bodies. Ketone bodies are appetite-suppressing and they may have an effect on the appetite centres in the brain. It's also well known that protein itself is very good at making people feel full-up.
13 Sep, 2011--
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