Guide

In your 30s

The 30s are the foundation decade. The cardiovascular, metabolic, and musculoskeletal trajectories you set now compound for the rest of your life. Few interventions feel urgent yet, but few decades have higher leverage.

Top five priorities

1. Build cardiorespiratory fitness: VO₂max headroom built now stays with you. Aim for the upper half of your age-sex reference range. See exercise.
2. Establish a resistance-training habit: muscle mass and strength built in your 30s buffer the decline you would otherwise see decades later. See sarcopenia.
3. Get a one-time Lp(a) measurement and a baseline lipid panel including apoB. Both are lifelong signals that change cardiovascular trajectory if you act early.
4. Sleep regularity: see sleep and circadian rhythm. Consistent timing > total hours.
5. Social and purpose foundations: build the relationships and meaningful work that will protect you in later decades. See social connection and purpose & meaning.

What to measure

• Baseline lipid panel (total chol, HDL, triglycerides, calculated LDL).
• apoB if available; otherwise non-HDL.
• One-time Lp(a).
• HbA1c and fasting glucose.
• hsCRP.
• Liver enzymes (ALT, AST, GGT) — NAFLD screening.
• Blood pressure (home cuff baseline).
• Vitamin D, B12 if at risk of deficiency.
• If female and planning fertility: cycle tracking, baseline TSH, AMH if family history of POI.

What to skip in your 30s

• Off-label rapamycin — the risk-benefit doesn’t justify it for most adults at this age.
• Off-label metformin — same.
• Expensive whole-body MRI screens — lower yield than at 40+.
• Comprehensive 100-marker panels — mostly add anxiety, not actionable change.