Effect of CAFfeine on Cognition in Alzheimer's Disease

This study is investigating whether caffeine can improve memory and thinking in people with Alzheimer's disease. Caffeine affects certain brain receptors that are involved in memory, and researchers want to know if it could be a safe and helpful treatment. **You may be eligible if...** - You are 50 years old or older - You have been diagnosed with probable Alzheimer's dementia, confirmed by brain imaging - Your memory score (MMSE) is 16 or higher, meaning you have mild to moderate symptoms - You have a caregiver or family member who lives with you and can participate - You are willing to follow a low-caffeine diet during the study (cutting out tea, caffeinated sodas, and large amounts of chocolate) **You may NOT be eligible if...** - You are currently experiencing a major depressive episode - You have another brain or nervous system condition - You have severe anxiety or sleep disorders - You have uncontrolled heart disease or serious heart rhythm problems - You currently smoke - You are pregnant or planning to become pregnant - You take medications that interact with caffeine metabolism Talk to your doctor to see if this trial is right for you.