Our sandwiches weren’t always this bad for us. Sandwiches have grown less healthy in the past 40 years, says Dariush Mozaffarian, a cardiologist and professor of nutrition and medicine at Tufts University. Culprits include highly processed grains in bread and the low-fat push that took off in the 1980s, which nutritionists now say led to the consumption of more deli meats marketed as low-fat.

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