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Imagine you have a time machine. You travel back to the day three identical brothers turn 30 years old. They share the same DNA, the same upbringing, and the same healthy bodies. Because they are identical triplets, their baseline health markers are a perfect match: they all have a healthy weight, great insulin sensitivity, and excellent cardiorespiratory fitness. But on this day, they choose three very different paths for the next 40 years.

Imagine a man named Bob. Bob is 52 years old, slightly overweight, and has been told his blood sugar is a little high—what doctors call prediabetes. Bob is worried about his heart, so he goes to his doctor for a check-up. After a quick blood draw, the results come back. The doctor smiles and says, "Good news, Bob! Your LDL cholesterol is 90. That is a perfect score. You have nothing to worry about."

For a long time, women have been told a very scary story. It was a story about menopause and the heart. If you reached the age where hot flashes started making you feel like you were standing in a furnace, you might have asked for help. But for years, many doctors would say, "No." They were afraid that taking hormones would give you a heart attack or a blood clot.

Imagine a high-end sports car. It is sleek, shiny, and built to win the toughest races. On the outside, it looks perfect. People stop and stare when it drives by because it looks like it could go 200 miles per hour. But deep inside the engine, there is a hidden problem. The fuel line - the pipe that carries gas to the engine - is almost completely plugged with gunk. The car can still drive, but it cannot reach its top speed. If that gunk keeps building up, the engine will eventually stop working altogether.

Imagine you just started a new medicine to help you lose weight. You are probably thinking about the numbers on your bathroom scale. You might be dreaming about fitting into your old favorite jeans or having more energy to play in the yard. But then, only a few weeks later, your doctor tells you something that stops you in your tracks. Even though you haven’t lost much weight yet, your heart is already much safer.