What Is Lifestyle Medicine? The Six Pillars Explained

The American College of Lifestyle Medicine (ACLM) describes it as an evidence-based medical specialty that uses therapeutic lifestyle interventions to prevent and manage chronic conditions such as cardiovascular disease, type 2 diabetes and obesity. Instead of looking only at the symptom, it focuses on the daily habits that drive those conditions.

In practice, lifestyle medicine is assessment, education, habits and coaching: a clinician reviews your health, helps you choose realistic changes and follows up on them. Medicines stay part of the plan when you need them.

The best-known study is the Diabetes Prevention Program (DPP). According to the NIDDK, adults at high risk of type 2 diabetes (what we now call prediabetes) in a structured lifestyle program (goals: lose 7% of body weight and exercise 150 minutes a week) lowered their chance of developing type 2 diabetes by 58% over about 3 years compared with placebo; metformin lowered it by 31%. In participants aged 60 and older, the reduction was 71%. The American Diabetes Association notes that some DPP participants returned to normal blood sugar levels, even if only once, and that this was linked with a lower risk of diabetes later. It does not happen for everyone.

For high blood pressure, the NHLBI reports that in the original trial the DASH eating plan (rich in vegetables, fruits and low-fat dairy) lowered blood pressure the most, even though all the diets in the trial had the same amount of sodium; follow-up reports found it also lowered LDL cholesterol. A later trial found that cutting sodium lowers blood pressure further: 1,500 mg a day lowers it more than 2,300 mg.

These results come from structured programs with follow-up; they are not a promise for every person. If you already live with a chronic condition, habits work alongside your treatment. See how we help with diabetes and blood pressure care.

Both talk about addressing the roots of health problems, but they are not the same. Lifestyle medicine rests on the six pillars and on guidelines built from large trials such as the DPP and DASH. The Institute for Functional Medicine describes functional medicine as a systems biology-based approach that looks for the root cause of disease; it often involves more lab testing and individualized plans, and research on the model itself is more limited.

Many people borrow from both. To see what the evidence says about that approach, read what functional medicine is.

Any clinician can build these habits into care. In addition, physicians can earn a credential from the American Board of Lifestyle Medicine (ABLM); credential holders are called diplomates.

ABLM is not one of the member boards of the American Board of Medical Specialties (ABMS), the body that groups the traditional US medical specialties. In August 2026, the American Board of Preventive Medicine, which is an ABMS member board, announced that ABMS approved a focused practice designation in lifestyle medicine that it will administer; the program was still being developed when we wrote this guide. So when you look for someone to work with, ask about their license, their training and how they follow up.

According to the CDC, Puerto Rico had the highest rate of diagnosed diabetes among adults of any US state or territory in 2021: 14.4%. Diabetes and high blood pressure often travel together, and both respond to eating pattern, activity and sleep.

The island’s heat and humidity change how you move: walk early or near sunset, drink water before you feel thirsty and look for shade.

Check with your doctor before a big change in exercise or eating if you have heart disease, chest pain with effort, or diabetes treated with insulin or sulfonylureas (such as glipizide or glimepiride). More activity and fewer carbohydrates can make those medicines cause low blood sugar, and the dose sometimes needs adjusting.

Never stop or change your medicines on your own. If you have chest pain or pressure, shortness of breath that does not ease, or you faint, call 911.

If you are in Puerto Rico, you can book an online visit with Dr. Diana Nieves Castro, a general practice physician licensed in Puerto Rico, to review your medicines, order labs when clinically appropriate and build a habits plan. Online visits are only for people who are physically in Puerto Rico.