The common ham sandwich, a staple for many, is being re-evaluated for its nutritional profile amidst broader concerns about processed meats and cancer risk. While processed red meats like bacon and sausages are linked to cancer due to preservatives known as nitrites, nutritionist Angela Dowden suggests that ham, particularly when prepared and consumed in certain ways, may not carry the same risks.
Concerns about processed meats stem from nitrites, which contribute to the characteristic pink color and flavor. These preservatives can react with compounds in meat to form nitrosamines in the stomach, chemicals associated with digestive cancers. A 2019 study indicated a 20 percent rise in bowel cancer risk for daily consumers of bacon or ham.
However, Dowden asserts that not all processed red meat is detrimental. She highlights that most packaged ham is a good source of protein and low in calories. Two slices can provide approximately 8g of protein for under 50 calories, with less than 0.5g of saturated fat, offering more protein than an equivalent serving of cheddar cheese and slightly more than one egg. Ham also contains essential vitamin B12 and thiamin, which aid in energy conversion. When paired with wholemeal bread, a ham sandwich can contribute a significant portion of daily fiber intake, which is known to help prevent bowel cancer.
The key difference, according to Dowden, lies in how ham is prepared compared to bacon. The formation of harmful nitrosamines is exacerbated by high heat. Pan-frying bacon until crisp can promote nitrosamine development in the pan, while grilling or barbecuing any meat can create other potentially carcinogenic chemicals like heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs). Boiled or steam-cooked ham, prepared at lower temperatures and consumed cold, contains fewer pre-formed nitrosamines.
Additionally, pork naturally has less haem iron than beef. Haem iron can contribute to nitrosamine formation during curing and cooking, suggesting ham might have a lower potential for this than cured beef products. The inclusion of ascorbate (a form of vitamin C) in modern curing brines also helps to intercept nitrites, reducing their conversion to nitrosamines. Stringent food safety regulations have also led to lower nitrite limits since the 1970s and 80s.
While ham sandwiches can be a source of sodium, with two slices accounting for about 10 percent of the daily limit, this is still less than in two rashers of bacon and comparable to some non-red meat sandwich options. Some ham products contain added phosphates for moisture retention, which can be a concern for individuals with kidney disease or potentially for healthy individuals with long-term high intake. However, phosphate-free varieties are available, and phosphoric acid in beverages like diet cola can contribute significantly higher phosphate levels.
For those concerned about nitrites, options like Parma ham or Serrano ham, which are cured without these compounds, are available. Many supermarkets also offer nitrite-free versions of standard deli hams. Dowden suggests that a varied diet is key to health and while a ham sandwich might not be an everyday meal, consuming it a couple of times a week, especially on wholemeal bread with a generous salad, can be a nutritionally sound choice.