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E. Coli. Eating undercooked ground beef is one of the main causes of E. coli, which can cause symptoms including diarrhea, vomiting and stomach cramps. These symptoms usually occur between two and eight days after eating contaminated food and can last for up to a week.
Aging can increase the meatâs tenderness. During the beef aging process, changes occur in parts of the muscle fiber and collagen structures. The action of the enzymes causes the muscle fibers to soften. After slaughter, rigor mortis takes places, which takes about 6 to 12 hours. Immediately following the rigor mortis process, the meatâs tenderness increases.