This study examined how oyster mushrooms change nutritionally and chemically as they mature from young to fully grown. Researchers found that while mature mushrooms have more overall nutrients and starch-like compounds, younger middle-stage mushrooms have higher levels of beneficial antioxidant compounds and special substances that may help manage blood sugar. The findings suggest that when and how you harvest mushrooms matters for what health benefits they provide, helping farmers and food makers decide when to pick mushrooms based on what they want to produce.