What is the fine-grained topic of the following text: The average American currently does not consume enough sources of Omega-3 fatty acids and consumes too many Omega-6 fatty acids, which are common in the modern food supply because of the advent of omega - 6 rich cereal grains in our diet and as the feed for livestock. Only return the topic.
Imbalance of Omega-3 and Omega-6 fatty acid consumption in the average American diet