By Dr. Priyom Bose, Ph.D. Reviewed by Lauren Hardaker Jul 18 2025 Researchers reveal how oak acorns turned into coffee-like drinks, pack potent antioxidants while staying safely below toxin limits, making them a surprising new superfood for health-conscious coffee drinkers. Study:  Oak Acorns as Functional Foods: Antioxidant Potential and Safety Assessment . Image credit: New Africa/Shutterstock.com Thermally processed oak acorns ( Quercus robur ) in their native flour form are rich in