Pregnancy Over 40 and NitratesI've heard that processed lunch meats can be a problem in pregnancy for a number of reasons.
This article addresses the use of nitrites as a preservative in meats and how they could be a problem in pregnancy:
From the article:
In recent years, the level of nitrates contained in processed foods has decreased, and is considered safe for pregnant women. In fact, nitrates are used as a preservative in meats, often making the meat safer than it would be otherwise, from a bacterial safety standpoint. However, I would suggest that you avoid them whenever possible, as foods containing nitrates, such as preserved meats like hot dogs and bacon, are not good nutritional choices for pregnant women because of their high sodium and fat content.