A molecule can clear Alzheimer's plaques from the brains of mice and improve learning and memory, Korean scientists have found in early tests.

Depending on the dementia your grandmother has (likely Alzheimer's), the effects should be reduced with healthy diet and exercise.

Uh...I think you can do a lot, lot better than this. Two interventions that have been studied extensively come to mind. First, treatment with melatonin is very beneficial, provided the dementia is not too far along. Google it yourself, sorry, I don't have references to help you.

Second, a bioactive form of Turmeric called Longvida, which was developed in 2012, has been the target of many studies and is showing a great deal of promise in treating dementia. Here are a few resources to start you off:

  1. Read "Diverse effects of a low dose supplement of lipidated curcumin in healthy middle aged people". Investigation of the effects of solid lipid curcumin on cognition and mood in a healthy older population
  2. Read "Investigation of the effects of solid lipid curcumin on cognition and mood in a healthy older population" Diverse effects of a low dose supplement of lipidated curcumin in healthy middle aged people.
  3. Different Brain Regions are Infected with Fungi in Alzheimer’s Disease Nature paper, very interesting work. What really jumped out at me was "In addition, brain infection by several pathogens may induce amyloid formation [24,25,26]. Furthermore, Αβ peptide exhibits antimicrobial activity and shows particularly strong inhibitory activity against Candida albicans [27.]​". Then consider A Review on Antibacterial, Antiviral, and Antifungal Activity of Curcumin, particularly the section on anti-fungal activity. Also Curcumin as a promising anticandidal of clinical interest and Curcumin as a promising antifungal of clinical interest.
  4. Turmeric compound boosts regeneration of brain stem cells, interestingly, the compound here is not curcumin, but an oil of turmeric, (ar-) turmerone.
/r/science Thread Parent Link - bbc.com