zlacker

The #1 marker you should be checking is blood pressure.

Cholesterol, Fasting Insulin levels, and (if male) free Testosterone are other good ones. Cholesterol and Insulin should be checked by all adults annually, and BP should be checked at least annually. T isn't checked as routinely, but it's worth knowing where you fit and has an impact on your metabolics and the test isn't a big deal.

>>gtop3+(OP)
Buying a cheap little glucose meter is really valuable IMO. You can get them for close to nothing, and you can use them to check your fasting glucose, or your glucose response after meals.

Also, resting heart rate is very easy to measure, especially if you have any kind of fitness/smart watch, and that's a good marker of health too.

I'm a fan of getting lab work done, but it's definitely more of a hassle.