I do not use ham with added nitrates and I also provide fruit and veg. (mumsnet.com)
Commercially prepared cured meats typically contain added nitrates, which can form potentially carcinogenic compounds when exposed to high temperatures (i.e. when cooked). (nourisheveryday.com)
Where possible, try and find a lower - sodium ham and turkey like Boar's Head, which makes low - sodium deli meats, or Applegate, which is free of added nitrates and nitrites. (thespruce.com)