Women tend to store fat in certain places. These are thighs, buttocks and the inside of the arms – it’s subcutaneous fat. We often try to get rid of it, but it leaves our body last. And this is not just so. According to a new study from the Medical College of Georgia of Augusta University, USA, this fat protects against brain inflammation that can lead to dementia and stroke, at least until menopause.
Men and women store their weight differently. In men, it is concentrated at the major abdominal organs – visceral obesity. It is known as more inflammatory, so the risk of inflammation-related problems increases. It’s about heart attack and stroke. After the onset of menopause in women, the risk levels out.
Fat as a protector against inflammation
According to Stranahan in the American Diabetes Association journal Diabetes, other likely factors that explain the estrogen-related differences are diet and genetics. She admits that the findings came as a surprise to her and considers them revolutionary.
Scientists examined the increase in the amount and location of adipose tissue, as well as levels of sex hormones and brain inflammation in male and female mice at different intervals. They were fed a high-fat diet.
Female mice store fat in the same way as females – as subcutaneous. Males – as visceral. The researchers concluded that the characteristic fat patterns may be a key reason for the protection against inflammation enjoyed by pre-menopausal females.
They found no signs of brain inflammation or insulin resistance, which also increase inflammation and can cause diabetes. Until the female mice reached menopause. At around 48 weeks, menstruation stops and the distribution of fat in females begins to shift slightly, becoming more male-like.
The scientists then compared the effects of a high-fat diet, which promotes inflammation throughout the body, in mice of both sexes after liposuction-like surgery to remove subcutaneous fat. They did nothing to directly interfere with normal estrogen levels, including removing the ovaries.
The loss increased brain inflammation in the women without changing the levels of estrogen and other sex hormones.
How subcutaneous fat reduces inflammation
The transition took place in about three months, which means several years in human time. By comparison, it wasn’t until after menopause that women who didn’t have their subcutaneous fat removed but ate high-energy foods had similar levels of brain inflammation to men, Stranahan says.
Don’t get liposuction to continue a high-fat diet, Stranahan says.
Body Mass Index (BMI) is overrated, she adds. It simply divides weight by height and is commonly used to indicate overweight, obesity and, as a result, increased risk of a host of diseases. A more accurate indicator of both metabolic risk and potential brain health is the waist-to-hip ratio, which is also easy to calculate. This is what the founder of the School of Women’s Health, gynecologist-endocrinologist Natalia Silina, constantly emphasizes.
Stranahan has been studying the effects of obesity on the brain for several years. She is one of the first scientists to show that visceral fat contributes to brain inflammation in obese male mice. Subcutaneous fat transplantation on the contrary reduces brain inflammation.