ACE Group Fitness Instructor Practice Exam 2025 - Free Fitness Instructor Practice Questions and Study Guide

DHA, or docosahexaenoic acid, is an omega-3 fatty acid primarily found in marine sources and certain algae. It plays a significant role in brain health and has various benefits for cardiovascular health. Foods that are rich in DHA include fatty fish like salmon, which is well-known for its high omega-3 content.

Walnuts and flaxseed are both sources of ALA (alpha-linolenic acid), another type of omega-3 fatty acid, which the body can convert into DHA, although the conversion rate is not very efficient. However, they do not provide significant amounts of DHA directly. In contrast, chicken is not a notable source of omega-3 fatty acids, including DHA. Chicken's fat content varies depending on the cut and cooking method, but it typically lacks the levels of omega-3s found in fish.

Thus, out of the options provided, chicken is the food that is least likely to contain DHA, making it the correct choice for indicating what is not considered a good source of this important fatty acid.