High visceral fat, also known as abdominal or central fat, is considered a predictor of heart disease and other chronic illnesses due to its association with several metabolic abnormalities and harmful effects on the body. Here are some reasons why high visceral fat is considered a risk factor:

1. Increased production of inflammatory substances: Visceral fat is metabolically active and releases various bioactive substances called adipokines. Some of these adipokines, such as tumor necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6), promote inflammation in the body. Chronic inflammation is linked to the development and progression of heart disease, insulin resistance, and other chronic conditions.
2. Insulin resistance: Visceral fat is closely associated with insulin resistance, a condition in which the body’s cells become less responsive to the effects of insulin. Insulin resistance can lead to elevated blood sugar levels and ultimately contribute to the development of type 2 diabetes. Diabetes is a significant risk factor for heart disease and other complications like kidney disease and neuropathy.
3. Dyslipidemia: Visceral fat accumulation is often accompanied by an unfavorable lipid profile, characterized by high triglyceride levels, low high-density lipoprotein (HDL) cholesterol levels, and increased levels of small, dense low-density lipoprotein (LDL) particles. This dyslipidemia pattern is associated with a higher risk of atherosclerosis (hardening and narrowing of arteries), which can lead to heart attacks and strokes.
4. Increased production of free fatty acids: Visceral fat releases free fatty acids into the bloodstream. High levels of circulating free fatty acids can interfere with insulin signaling and contribute to insulin resistance. They also have detrimental effects on blood vessels, promoting inflammation and impairing vascular function, which can increase the risk of heart disease.
5. Visceral fat’s proximity to vital organs: Unlike subcutaneous fat (fat located just beneath the skin), visceral fat is located deep within the abdominal cavity, surrounding vital organs like the liver, pancreas, and intestines. This visceral fat accumulation near critical organs may contribute to metabolic dysfunction, hormonal imbalances, and oxidative stress, further increasing the risk of chronic diseases.

It’s important to note that the distribution of body fat, specifically visceral fat, is influenced by a combination of genetic, environmental, and lifestyle factors. Regular physical activity, a balanced diet, and maintaining a healthy weight can help reduce visceral fat accumulation and mitigate the associated health risks.