Most 40-year-old men who manifest these conditions are substantially different physical specimens compared to when they were in high school or college. A lean 6 footer weighing 170 pounds at age 20 will often weigh 220 pounds or more by age 40. The majority of that additional weight is in the form of fat, and its deposition often developed as a consequence of two simple things: overeating and a lack of exercise.
The additional fat mass that men collect as they age should be viewed as a "mass of inflammation." Interestingly, white blood cells collect in excess fat tissue and begin to release inflammatory chemicals into circulation. Fat cells also release various inflammatory chemicals. The outcome is that the man becomes generally inflamed, which can be quantified by measuring the C-reactive protein level with a simple blood test.
While this approach is obviously simple in application, there is inherent difficulty for many when trying to change dietary behaviors, especially if they have persisted for years. Sticking to eating healthy food is a challenge; however, consider the pro-inflammatory consequences that make a nightmare of the middle-age years, and one might well be motivated to practice a little prevention and avoid the dire health consequences later.
The typical recommended level of supplemental magnesium is 400 mg per day. Fish oil is more complicated because we want to get 1,000-3,000 mg of EPA/DHA per day. EPA/DHA are the omega-3 fatty acids found in fish oil. In general, each fish oil capsule contains 1,000 more milligrams of oil; however, you must make sure the supplement includes 1,000 mg of the combination of EPA/DHA.