The humble sandwich, a staple of American lunch boxes and deli counters nationwide, may harbor hidden dangers that health experts increasingly warn could raise your risk of cancer, heart disease, and diabetes.
Research has consistently shown that processed meats — those preserved by smoking, curing, salting, or adding chemical preservatives — pose significant health risks when consumed regularly. The World Health Organization classified processed meat as carcinogenic in 2015, placing it in the same category as cigarettes and asbestos, though the levels of risk differ substantially.
“Research shows that eating processed meats like bacon and cold cuts can increase your chances for stomach and colorectal cancer,” said Lindsey Wohlford, employee wellness dietitian at MD Anderson Cancer Center. Health experts now recommend avoiding these products entirely or limiting them to rare, special occasions.
Among the most concerning lunch meats that nutritionists suggest eliminating from your regular diet are:
1. Bologna
Perhaps the most problematic of all deli meats, bologna tops the list of products to avoid. Made of cured beef, pork, or a mixture of the two, bologna contains a cocktail of spices, salt, chemicals, and preservatives that place it firmly in the category of ultra-processed foods. Its high fat content and sodium levels make it particularly troublesome from a cardiovascular perspective.
2. Salami
This cured sausage presents multiple health concerns due to its preparation method and ingredients. “Fatty, processed luncheon meats like bologna, salami and pepperoni have large amounts of saturated fat and sodium, both of which have been linked to cancer, obesity and heart disease,” explains Julia Zumpano, a registered dietitian at the Cleveland Clinic. Salami’s high sodium content — often exceeding 500mg per serving — contributes to hypertension risk.
3. Pepperoni
Though most commonly associated with pizza, pepperoni often makes its way into sandwiches and charcuterie boards. Like salami, it contains concerning levels of saturated fat and sodium, along with nitrates and nitrites used as preservatives. These compounds convert to potentially carcinogenic nitrosamines in the body, especially when heated.
4. Processed Ham
Store-bought ham typically undergoes extensive processing. When nitrates and nitrites are added to preserve the meat and are later exposed to heat, they become harmful and can damage the colon, causing cells to mutate and potentially forming tumors, according to research from cancer centers. Even products labeled “natural” or “nitrate-free” may use celery powder, which contains naturally occurring nitrates with similar effects.
5. Hot Dogs
Though not traditional sandwich meat, hot dogs represent one of the most concerning processed meat products. Eating just 50 grams of processed meat daily — equivalent to one hot dog or two slices of ham — increases colorectal cancer risk by approximately 16%, according to research. Hot dogs typically contain mechanically separated meat along with numerous preservatives and fillers.
Health experts emphasize that the risk from these products accumulates over time with regular consumption. Dr. Frank Hu, Professor and Chair of the Department of Nutrition at Harvard T.H. Chan School of Public Health, notes that “the current evidence suggests the higher intake of processed meat, the higher the risk of chronic diseases and mortality.” However, he adds that consuming small amounts occasionally (once or twice a month) is unlikely to have an appreciable health impact.
For those looking to make healthier sandwich choices, experts recommend several alternatives. Instead of processed meats, consider roasting a chicken on the weekend for sliced sandwich meat, or using other protein sources like hummus, roasted chickpeas, or hard-boiled eggs. Even storebought rotisserie chicken, while still containing sodium, avoids the harmful preservatives found in processed meats.
A recent study in The Lancet found that higher intakes of ultra-processed foods, including deli meats, were associated with up to 23% higher risk of coronary heart disease and a 9% higher risk of stroke compared to people consuming the lowest amounts.
For those unwilling to eliminate sandwich meats entirely, dietitians suggest looking for products specifically labeled low-sodium, avoiding those containing nitrates or nitrites (including “natural” versions), and minimizing consumption of any processed meat to occasional treats rather than daily staples.
The MD Anderson Cancer Center recommends avoiding processed meats entirely for cancer prevention, noting that evidence has been accumulating for years linking these products to increased risk.
Health experts emphasize that dietary patterns, rather than single food choices, determine overall health. A diet rich in vegetables, fruits, whole grains and plant proteins can help counterbalance occasional processed meat consumption, though the evidence suggests the safest approach is to minimize these products in your regular meal planning.
