I'm a doctor who studies longevity. Here are 8 things I always put in my Trader Joe's cart — and 4 I never buy.

As a doctor studying longevity, my usual Trader Joe's cart covers fiber, omega-3s, fermented foods, and healthy fats. Ingrid Yang As a physician studying longevity, I'm mindful when filling up my cart at Trader Joe's. I buy a lot of fresh and frozen produce, plus fiber-packed legumes and lentils. Premade frozen entrées have too much sodium for me, and I prefer local produce over salad kits. I'm a board-certified internal medicine physician who studies longevity, so I'm used to people asking…