This vitamin is essential for preserving metabolism-revving muscle tissue. Unfortunately, researchers estimate that a measly 4% of Americans over age 50 take in enough vitamin D through their diet. Get 90% of your recommended daily value (400 IU) in a 3.5-ounce serving of salmon. Other good sources: tuna, shrimp, tofu, fortified milk and cereal, and eggs.
It isn’t so much the metabolism slowing in my 50’s as it is the bad habits associated with youth. A box of Mac and Cheese was not a bad choice when competitive and highly active, I needed the carbs. But the mindset that a full box is a single sized serving remains despite the slow down in activity and metabolism. That’s where the real challenge lies. Too many years of eating rabbit food only after it was processed into a rabbit (or steer preferrably) with potato or corn as the only acceptable vegetable.