Eating vegetables and proteins before
carbs may impact blood sugar Published June 26, 2015
Reuters Overweight and obese people
with type 2 diabetes may feel better after a meal if they start it off with
vegetables or proteins and end with the carbs, suggests a new study of 11
people. Finishing the broccoli and chicken before tucking into bread and fruit
juice was tied to a lower rise in blood sugar levels over the next two hours,
compared to eating the same foods in the opposite order, researchers report.
When we saw the result, we were really encouraged that this is something that
could potentially benefit people," said Dr. Louis Aronne, the study's
senior author from Weill Cornell Medical College in New York. Approximately 29
million Americans - about 9 percent of the U.S. population - have diabetes,
according to the Centers for Disease Control and Prevention. About 30 percent
of those people are undiagnosed. Type 2 is the most common form of diabetes and
is often linked to obesity. In type 2 diabetes, the body's cells are resistant
to the hormone insulin, or the body doesn't make enough of it. Insulin helps
the body's cells use glucose in the blood for fuel. Drinking whey protein
shakes before meals has been linked to lower blood sugar levels after eating,
but little was known about the influence of foods, and the order in which
they're consumed, on blood sugar levels following a meal, the researchers
write. Blood sugar normally rises after eating, but for people with diabetes it
can spike dangerously. Diabetics are often told to avoid foods high on the
glycemic index - a measure of how rapidly a food gets converted to glucose in
the blood - like white breads and sugary drinks. The new research suggests that
people may benefit from timing their consumption of carbohydrates during a meal
instead of simply avoiding certain foods. The researchers recruited 11 people
with type 2 diabetes who were all overweight or obese. They were also taking a
drug called metformin, which helps to control blood sugar. The participants all
fasted for 12 hours overnight before consuming a 628 calorie meal with protein,
carbohydrates and fat. One week, they consumed the carbohydrates (ciabatta
bread and orange juice) first. Then they ate skinless grilled chicken, a small
salad and buttered steamed broccoli 15 minutes later. The participants ate the
same meal a week later, but the order of the foods was reversed, with the salad
and broccoli first, then the chicken, then the carbs. The researchers also took
blood samples before the meals and 30, 60 and 120 minutes afterward. When the
participants ate vegetables and proteins first, their blood sugar levels were
about 29 percent lower 30 minutes after starting the meal, compared to when
they ate the carbs first. At 60 and 120 minutes after participants began
eating, blood sugar levels were 37 percent and 17 percent lower, respectively,
compared to when the carbs came first. "It's possible what this is doing
is delaying or tempering how fast the carbohydrates get absorbed," said
Dr. Sethu Reddy, chief of the Adult Diabetes Section at the Joslin Diabetes
Center in Boston. "I think certainly it's an interesting study that says
eating a good salad before your meal may help with glucose absorption,"
said Reddy, who was not involved with the new study. The new study may not be
the full story. For example, he said, it will be important to see what
happens beyond two hours, and what's happening to the carbohydrates. The
researchers also say more studies with longer follow-up times are needed.
"We're doing the next study." We're doing a longer study and
we're looking at some of the other key hormones. As of now, he said, the theory
is that the absorption of the carbohydrates is somehow slowed down by eating
vegetables, which are low on the glycemic index. "This shows that the
highly desired foods can be a part of a diet if we sneak them in there,"
Aronne said.
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