Top 6 Healthy Trader Joe’s Products of 2020, According to Dietitians Karla Walsh Replay Video Why dietitians love Trader Joe's Thanks to Trader Joe's careful curation, the chain only has an assortment of around 2,000 products at a time. That's compared to a staggering 28,112 products at the average American supermarket, per the Food Industry Association. A trip to Trader Joe's is like hitting the "easy button" on grocery shopping. Rather than being crippled by choosing between 50 different jams at a regular grocery store, Trader Joe's might offer 12—with a few of those rotating in and out seasonally, or new items introduced to mix things up. So it's no wonder that there are almost 20 staple foods that nutritionists always buy at Trader Joe's.