According to the underlying article, which is based on this study, “Working 75 hours or more doubled the risk for a cardiovascular problem — angina, coronary heart disease, hypertension, stroke or heart attack.”
Let’s imagine what the factor involved in working 75 hours per week might increase heart disease, high blood pressure, strokes or heart attack. In my estimation it would not be “working” that causes heart disease or high blood pressure. Perhaps the person that works that many hours per week also must rely on dining out, junk food, and eating on the run for most of their weekly meals. Just guessing but working 75 hours per week would not leave much time for home cooked eating.
Unless you are in India. In India they have devised a system whereby women use their home kitchens to cook fresh natural lunch meals for customers located in occupations in the city. These Tiffin lunch containers are packed into thermal bags and a bicyclist collects them from the cooks, and when he has a bike-full he rolls them to the destination, collects the payments and delivers that back to the kitchens. I wonder if this same study would find the same issues with long working hours in Mumbai? Well, I don’t know but it would be worth checking into.