I thought I was reasonable fit for my age despite carrying too much weight in the mid section. However, a blood test last month revealed high triglyceride level (235) which, according to my doctor, was in the "prediabetic" range. According to many Internet sites, a daily walk of at least 1/2 hour dramatically lowers triglycerides - so I've been doing just that. That and diet. Triglycerides don't cause diabetes, but when they're high, they're a signal that your body is becoming resistant to insulin. Exercise and diet reduces insulin resistance. The high triglyceride red flag then comes down. Any middle aged folks like me should have triglyceride level checked. We all want to be around to see our grand kids grow up.