4 Surprising Ways Obesity Could Weaken Immune System Obesity increases the chances of developing severe issues that affect nearly every organ and tissue of the body. These include the heart, brain, blood vessels, liver, gallbladder, and bones. Excess body fat increases the risk of type 2 diabetes, hypertension, cardiovascular diseases, and premature death. According to scientists, obesity (body mass index [BMI] of 30-39) or being overweight (BMI of 25-29) can also weaken the body’s immune system. Several studies have linked obesity with a reduced ability to fight infections. Here are…