Whether we like it or not, everyone accumulates fat. For women, it usually accumulates around the hips, resulting in a pear-shaped look. In men, fat tends to build up around the abdomen, creating an apple shape. Visceral fat shows strong links to cancer, insulin resistance, cardiovascular disease and other metabolic problems. It is also a fat that is highly active and constantly pumping poisons into the bloodstream.
As it turns out, it’s healthier to be a pear than an apple.
Men are more likely than women to store excess fat in the midsection and develop a beer belly, whether they drink alcohol or not. Women typically store fat lower on the body, which is less of a health hazard (some studies, in fact, have found that this kind of fat may even be protective in some ways). Because of these gender differences, sex hormones probably help determine where fat is deposited. Still, women can be apple-shaped, too, with all the risks that entails. After menopause, in particular, many women start to accumulate more fat around the waist. Heredity and activity level also affect your body’s shape.
Why is it bad to be apple-shaped? Abdominal obesity increases the risk of having high LDL (bad) cholesterol, triglycerides (fats in the blood), blood pressure, and blood sugar, as well as insulin resistance and low HDL (good) cholesterol. This cluster of problems is now known as the metabolic syndrome, which in turn increases the risk of diabetes, coronary artery disease, stroke, and some cancers. Abdominal obesity has also been linked to elevated C-reactive protein (a sign of inflammation) and blood clotting abnormalities, both of which play a role in cardiovascular disease.
A research team at the University of California, Riverside, has found that only male mice experienced neuroinflammation, or activation of the immune system’s response in the brain, after being fed a high-fat diet. While females were unaffected, males showed low testosterone and reduced sperm count, in addition to neuroinflammation.
Study results appear in the journal Frontiers in Immunology.
Estrogen Not a Factor In Neuroinflammation
Clinical studies have led researchers to believe females are protected against weight gain when they are young because of ovarian estrogen. The understanding has been that women gain weight after menopause because of a precipitous drop in estrogen, resulting in a decline in health parameters, including obesity.
“We addressed this assumption by removing ovaries in young mice,” said Djurdjica Coss, an associate professor of biomedical sciences in the UC Riverside School of Medicine, who led the study. “We found that the mice proceed to gain weight when fed a high-fat diet, suggesting that ovarian hormones are indeed protective against weight gain. But we found, too, that these female mice exhibit neither neuroinflammation, nor changes in reproductive hormones, suggesting that they are protected by factors other than ovarian estrogen. This is a novel finding.”
The findings, derived from the mouse study, are likely to have applications in humans, Coss added.
The Cascading Effects of Obesity
“Mice on high-fat diet develop metabolic syndrome — a constellation of pathologies that includes Type 2 diabetes and insulin insensitivity — similarly to obese humans,” she said. “Obese men have lower testosterone levels, contributing to low libido, low energy, and reduced muscle strength. We see this in mice, too; obese male mice showed nearly 50 percent decreases in testosterone and sperm number. Obese women have difficulty with their menstrual cycles. They don’t ovulate. Obese female mice show the same, contributing to decreased fertility. Interestingly, 18 percent of couples in the United States now need medical interventions — hormonal treatments, in vitro fertilization — to conceive a child. Obesity is a likely factor.”
Increased obesity is a public health concern in the United States, where more than 30 percent of people are obese, and more than two-thirds are overweight. Obesity has been associated with mental decline and an increased rate of stroke, in addition to other problems affecting the internal organs. In the U.S., some ethnic minority groups are disproportionately affected by obesity.
Female women and mice deposit fat differently than their male counterparts. Females deposit fat subcutaneously, right below the skin, while males accumulate fat deeper, in the body’s visceral region, which may affect internal organs.
Eventually, even in women, the subcutaneous regions get overwhelmed with fat and the abdominal region begins to show obesity, which leads to neuroinflammation.
“While overweight, women are more protected than men where neuroinflammation is concerned,” Coss said. “This could be an evolutionary protection for women, who need to experience more change in weight due to pregnancy. This protection is significantly curtailed when overweight women become obese and fat gathers around the waist.”
Next, Coss and her team will explore, in mice, how abdominal weight is linked to neuroinflammation.
“We know that abdominal fat — that is, fat around visceral organs — gets more inflamed with a fat overburden,” she said. “This fat then recruits immune cells from blood circulation that get activated.”
New Insight Into The BrainAnother important finding reported in the study is that peripheral immune cells, macrophages in particular, cross the blood-brain barrier — the protective barrier stopping the influx of most compounds from the blood to the brain. This infiltration of peripheral immune cells into the brain occurs in addition to the activation of resident immune cells.
“The brain has been considered an ‘immune protected site,’ but we show that peripheral inflammation ‘spills over’ into the brain, which, in turn, may cause neuronal problems mentioned above,” Coss said.
Coss explained that it is unclear what causes this activation, and that her research team plans further investigation.
“We know the immune cells secrete cytokines, which are inflammatory markers, in the blood. It’s possible these cytokines travel in blood from the fat tissue and activate the immune cells to cross the blood-brain barrier,” she said. “It’s possible, too, that other immune cells contribute to the neuroinflammation. Clearly, our work has provoked several research questions we would like to answer.”
Coss acknowledged weight is a sensitive topic even for clinicians who have a difficult time talking about it to patients.
“After all, we associate food with happiness, social interactions, and family gatherings,” she said. “Still, my advice is: ‘Watch your diet! And keep an eye on body weight, particularly around the abdomen.’”
Fitness: Focus on chest, stomach and arms, as this is where fat accumulates for apple shaped people.
Fitness: Lots of leg work will help you sculpt your thighs. Cardio is essential. Also, focus on building your upper body more through strength training to create an hour-glass look.
This post appeared first at Prevent Disease
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