The package directions recommended heating the fully cooked bacon for 30 s in the microwave, but some consumers may heat the product for a longer time to produce crispier bacon. Therefore, we investigated the effect of heating time on HCA formation. The HCAs in unheated bacon, and bacon heated for 30 and 60 s are shown in Table 6. As expected, the cooking loss of bacon heated for 60 s (24.2%) was higher than that of bacon heated for 30 s (20.9%), and the bacon heated for 60 s was crispier and darker than the bacon heated for 30 s. Bacon heated for 30 or 60 s had significantly higher levels of IQ, MeIQx, and PhIP than unheated bacon (p < 0.05).