Prevention Starts With Understanding Risk

Modifiable risk factors, screenings, and vaccination and prevention evidence, organized without overpromising certainty.

What This Hub Covers

Prevention evidence is organized around three categories: modifiable risk factors (diet, activity, sleep, tobacco and alcohol use), screening evidence (what a screening test can and cannot tell you), and vaccination and infection-prevention evidence. Every claim here follows the same evidence-strength labeling used across the Evidence Library.

Why We Say "Risk Reduction," Not "Prevention" Guarantees

Most modifiable risk factors reduce the probability of a disease outcome across a population; they rarely eliminate individual risk entirely. When the underlying research supports a lower probability of an outcome rather than a guarantee, we say may reduce risk rather than prevents. This is a deliberate editorial choice, not hedging for its own sake; see the Editorial Standards page for the full language policy.

Evidence Records in This Area

• Mediterranean diet and all-cause mortality, evidence strength: Strong
• HIIT vs. moderate-intensity exercise for cardiovascular health, evidence strength: Moderate
• Time-restricted eating and metabolic health, evidence strength: Emerging
• Vitamin D supplementation and respiratory infections, evidence strength: Moderate

Browse the full, filterable set in the Evidence Library or by topic in Disease Prevention.

Screenings and Guidelines

Screening recommendations (what to screen for, at what age, and how often) change as evidence evolves and generally come from bodies such as the U.S. Preventive Services Task Force, the CDC, and relevant specialty societies. Always confirm current, personalized screening guidance with a clinician, since individual risk factors change what is appropriate.

Medical Disclaimer

This page provides educational information about prevention research, not an individualized prevention or screening plan. Talk with a qualified clinician about which prevention measures and screenings are appropriate for you.