If you add raw ground beef, what about the grease in the meat mixing in with the chili? ill..
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3I edited your question to avoid off-topic health issues. We are happy to discuss flavor, but we're not qualified to address health claims. – Jolenealaska♦ Sep 27 '15 at 22:02
The amount of grease the meat exudes is dependent upon the amount of fat in the beef. If your beef is lean (<10% fat), you will not likely notice a difference in the greasiness in the final product by not straining. If your meat is fatty (ground beef in the US can contain up to 30% fat), then the final product will have noticeable grease. The fat contributes in a good way (IMO) to the flavor and mouth-feel of chili if the meat is in the 15% range.