Vegetarian dieting may lead to greater weight loss

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Vegetarian dieting may lead to greater weight loss

"Dieters who follow a vegetarian eating plan lose nearly twice as much weight," the Daily Mail reports following the results of a new study.

Researchers randomly assigned two groups of people with type 2 diabetes to either a vegetarian diet or a standard weight loss diet. They found those on the vegetarian diet lost more weight and more body fat.

Both diets involved reducing daily calorie consumption by 500 calories a day. The standard weight loss diet in this study is a diet recommended for people with diabetes. The vegetarian diet consisted of leafy vegetables, nuts, fruit, and grains.

After six months, researchers found those in the vegetarian group had lost about twice as much weight as those in the other group – 6.2kg, compared with 3.2kg.

But this isn't surprising – more people stuck to this diet compared with those on the standard weight loss diet.

The media failed to make it clear that the study was carried out on overweight people with type 2 diabetes, and therefore the findings may not apply to other people trying to lose weight.

If you have type 2 diabetes and you're overweight, you should aim to lose weight as this will help control your symptoms. Some people may benefit from switching to a vegetarian diet, but it's not a magic bullet.

The important thing if you're trying to lose weight is to reduce your daily calorie intake and get more exercise. Learn more in the weight loss guide.

Where did the story come from?

The study was carried out by researchers from the Institute for Clinical and Experimental medicine, Charles University, and the Institute of Endocrinology, all in the Czech Republic, and the Physicians Committee for Responsible Medicine in the US.

It was funded by a project grant from the Ministry of Health in Prague.

The study was published in the peer-reviewed Journal of the American College of Nutrition on an open access basis, so it's free to read online.

The UK media's coverage of the study was generally accurate, although the Mail's claim that "vegetarian dieters find their eating plan and exercise routine easier to stick to" was unfounded. 

There may be many reasons why a few more participants in the vegetarian group stuck to their diet. And, because of the small numbers involved in the study (37 in each group), the results could be down to chance.

What kind of research was this?

This randomised controlled trial (RCT) involved participants with type 2 diabetes who either had a vegetarian diet or a conventional diabetic diet. They then had their fat measures taken.

An RCT is the best way of comparing the effect of diets on health outcomes, as it allows control over other variables that might potentially affect the results.

What did the research involve?

The researchers took a group of 74 men and women who had type 2 diabetes and assigned half of them to a vegetarian diet and the other half to a conventional diabetic diet.

All the participants had a body mass index (BMI) over 25, meaning they were overweight.

The researchers followed them at three months and six months to measure how much weight they'd lost.

Both diets were calorie restricted (reduced by 500 kcal per day). The vegetarian diet consisted of vegetables, grains, legumes, fruits, and nuts, and was around 60% carbohydrates, 15% protein and 25% fat. The conventional diabetic diet was made up of around 50% carbohydrates, 20% protein, and less than 30% fat.

Adherence to the diets was measured as part of the research. High adherence was defined as daily energy intake of no more than 100kcal in excess of what had been prescribed, while medium adherence was no more than 200kcal in excess. 

Participants were asked to not alter their existing exercise habits for the first 12 weeks, and were then prescribed tailored exercise programmes to do three times a week.

MRI scans of the participants' thigh muscles were taken at baseline, three months, and six months. Two types of fat were measured: fat just under the connective tissues (subfascial) and fat just under the skin (subcutaneous).

What were the basic results?

The vegetarian diet was almost twice as effective at reducing body weight compared with the conventional diet.

Overall, participants lost 6.2kg (95% confidence interval [CI] -6.6 to -5.3) on the vegetarian diet, versus 3.2kg (95% CI -3.7 to -2.5) on the standard weight loss diet.

The greater weight loss seen in people on the vegetarian diet was also accompanied by greater muscle loss of -5.0cm2 (95% CI -5.7 to -4.3) versus -1.7cm2 (95% CI -2.4 to -1.0).

Subfascial fat was only reduced in those who were on a vegetarian diet (-0.82 cm2, 95% CI -1.13 to -0.55).

When it came to sticking to the diet, there was:

  • high adherence in 55% of the participants on the vegetarian diet and in 32% on the conventional diet
  • medium adherence in 22.5% of participants on the vegetarian diet and in 39% on the conventional diet
  • low adherence in 22.5% of participants on the vegetarian diet and in 29% on the conventional diet

How did the researchers interpret the results?

The authors concluded that their data "indicate that a vegetarian diet is more effective in reducing subfascial fat and tends to also reduce intramuscular fat more than a conventional hypocaloric diabetic diet.

"Our data suggest the importance of both subcutaneous and subfascial fat in relationship to glucose and lipid metabolism."

They say that, "Further research is needed to determine how dietary interventions with different diet composition can influence thigh fat distribution in relationship to glucose and lipid metabolism." 

Conclusion

This research appears to show that there's some association between following a vegetarian diet and a greater reduction in body mass and subfascial fat.

But this study has a number of limitations, and the conclusions drawn by the researchers should be interpreted cautiously.

  • There was lower adherence to the diet in the conventional diet group than the vegetarian one. This means the finding of a greater reduction in body mass in the vegetarian group is unsurprising.
  • The thigh was the only part of the body where fat measurements were taken. It could be the case that reduction in abdominal fat – a big risk factor for type 2 diabetes – didn't differ between the groups.
  • The proportion of fat recommended in the vegetarian diet was lower than in the conventional diet, so it would be expected that fat reductions would be greater in the vegetarian group.
  • The vegetarian diet was actually almost vegan, as the only animal product allowed was a small amount of yoghurt. Following a vegetarian diet without these extra restrictions might not bring about the same results.
  • The vegetarian group also lost more muscle mass than the conventional group, particularly when doing their usual exercise routine. This might be an unwanted outcome and a disadvantage when compared with the usual diet.
  • The study involved a relatively small sample of overweight people with type 2 diabetes. The findings may not be applicable to the general population.

Based on the findings of this study, we can't say that a vegetarian diet is more beneficial than a conventional diet for people with type 2 diabetes.

What we can say is that the vegetarian diet resulted in greater weight loss, and a reduction in some types of bodily fat, for the people who took part in this small study.

The additional loss of muscle mass might mean it's not preferable to the conventional diet currently recommended for people with diabetes.

If you have type 2 diabetes and are concerned about your weight, talk to your GP or diabetes care team. Achieving a healthy weight should help you control your symptoms and reduce the risk of complications.

Find out more about living with type 2 diabetes.

Links To The Headlines

Vegetarian diets twice as effective for weight loss as carnivorous meal plans, says study. The Independent, June 13 207

Why a vegetarian diet guarantees slimming success: Cutting out meat nearly doubles weight loss by changing how we store fat. Daily Mail, June 14 2017

Links To Science

Kahleova H, Klementova M, Herynek V, et al. The Effect of a Vegetarian vs Conventional Hypocaloric Diabetic Diet on Thigh Adipose Tissue Distribution in Subjects with Type 2 Diabetes: A Randomized Study. Journal of the American College of Nutrition. Published online June 10 2017

via NHS Choices: Behind the headlines More READ


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