Obesity may develop when we eat too much, as a result of chronically high insulin levels, not the other way around.
This is the conclusion of a mouse study, which challenges the widespread view that rising insulin is a secondary consequence of obesity and insulin resistance.
The new study helps to solve this chicken-or-the-egg dilemma by showing that animals with persistently lower insulin stay trim even as they indulge themselves on a high-fat, all-you-can-eat buffet.
The findings come as some of the first direct evidence in mammals that circulating insulin itself drives obesity, the researchers said.
The results are also consistent with clinical studies showing that long-term insulin use by people with diabetes tends to come with weight gain, said James Johnson of the University of British Columbia.
"We are very inclined to think of insulin as either good or bad, but it's neither. This doesn't mean anyone should stop taking insulin; there are nuances and ranges at which insulin levels are optimal," Johnson said.
Johnson and his colleagues took advantage of a genetic quirk in mice: that they have two insulin genes. Insulin1 shows up primarily in the pancreas and insulin2 in the brain, in addition to the pancreas. By eliminating insulin2 altogether and varying the number of good copies of insulin1, the researchers produced mice that varied only in their fasting blood insulin levels.
When presented with high-fat food, those with one copy and lower fasting insulin were completely protected from obesity even without any loss of appetite. They also enjoyed lower levels of inflammation and less fat in their livers, too.
Those differences traced to a "reprogramming" of the animals' fat tissue to burn and waste more energy in the form of heat. In other words, the mice had white fat that looked and acted more like the coveted, calorie-burning brown fat most familiar for keeping babies warm.
Johnson said it isn't clear what the findings might mean in the clinic just yet, noting that drugs designed to block insulin have been shown to come with unwanted side effects.
But, he added, "there are ways to eat and diets that keep insulin levels lower or that allow insulin levels to return to a healthy baseline each day."
Unfortunately, constant snacking is probably not the answer.
The finding has been reported in Cell Metabolism, a Cell Press publication. (ANI)