For patients with diabetes, it is better to eat a single large meal than several smaller meals throughout the day, a new study has found.
Researchers at Linkoping University in Sweden studied the effect on blood glucose, blood lipids and different hormones after meals were compared using three different macronutrient compositions in patients with type 2 diabetes.
The three diets were a low-fat diet, a low-carbohydrate diet and a Mediterranean diet. The scientists included 21 patients that tested all three diets in a randomised order. During each test day blood samples were collected at six time points.
The low-fat diet had a nutrient composition that has traditionally been recommended in the Nordic countries, with about 55 per cent of the total energy from carbohydrates.
The low-carbohydrate diet had a relatively low content of carbohydrate; approximately 20 per cent of the energy was from carbohydrates and about 50 per cent of the total energy came from fat.
The Mediterranean diet was composed of only a cup of black coffee for breakfast, and with all the caloric content corresponding to breakfast and lunch during the other two test days accumulated to one large lunch.
Furthermore, the total caloric content included energy from 150 ml (women) to 200 ml (men) of French red wine to ingest with the lunch.
The food in the Mediterranean diet had an energy content from carbohydrates that was intermediate between the low-fat and the low-carbohydrate meals, and sources of fat were mainly olives and fatty fish.
"We found that the low-carbohydrate diet increased blood glucose levels much less than the low-fat diet but that levels of triglycerides tended to be high compared to the low-fat diet," said Doctor Hans Guldbrand, who together with Professor Fredrik Nystrom was the principal investigator of the study.
"It is very interesting that the Mediterranean diet, without breakfast and with a massive lunch with wine, did not induce higher blood glucose levels than the low-fat diet lunch, despite such a large single meal," said Nystrom.
"This suggests that it is favourable to have a large meal instead of several smaller meals when you have diabetes, and it is surprising how often one today refers to the usefulness of the so-called Mediterranean diet but forgets that it also traditionally meant the absence of a breakfast," Nystrom said.
"Our results give reason to reconsider both nutritional composition and meal arrangements for patients with diabetes," Nystrom said.
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