Dr. Jeremy London, a seasoned heart surgeon, has spent decades witnessing what long-term neglect does to the body. In a TikTok filmed with his sons, he’s asked what people should avoid after turning 40 — and his answers reflect both medical expertise and hard-earned wisdom. His first warning is about alcohol, which he calls “toxic to every cell.” Years in the operating room have shown him how it damages not just the liver but also the heart, blood vessels, and brain. Cutting back, he says, is one of the simplest ways to protect long-term health.

His next rule is uncompromising: no smoking or vaping. As someone who regularly treats the consequences — hardened arteries, oxygen-starved tissues, and failing hearts — he emphasizes that these habits are far more dangerous than most people realize. Then he shifts to something more personal: sleep. Dr. London admits he struggles with it himself, but stresses that restful sleep becomes essential after 40, when the heart, immune system, and mind depend heavily on nightly recovery.

Finally, he focuses on emotional health. Toxic relationships, chronic stress, and loneliness, he says, can injure the heart as surely as cigarettes or high blood pressure. Protecting your peace and surrounding yourself with supportive people becomes a crucial form of medicine — one science is just beginning to appreciate.

Dr. London’s message is simple but profound: nourish lightly, rest deeply, avoid toxins, and cherish the people who keep you grounded. After forty, health isn’t just about adding years to life — it’s about preserving the parts of yourself that make life worth living.