Heat stress and dehydration are significant risks for diabetic pilgrims during the Hajj, often leading to severe complications. Standard Oral Rehydration Salts (ORS) are effective for rehydration but may cause hyperglycemia in diabetic patients due to their glucose content. This study aims to evaluate the efficacy and safety of a modified ORS formula ( Amr and khulood ORS) , specifically designed for diabetic individuals, in maintaining hydration without adversely affecting blood glucose levels. The study will involve a randomized controlled trial comparing the modified ORS (Amr and khulood ORS) with standard ORS among diabetic pilgrims experiencing heat stress. Key outcomes include hydration status, electrolyte balance, and glycemic control.