My 82 year old Mum with advanced Alzheimer’s boosting her immune system with Vitamin D (The Sun) in the middle of the Australian Winter. Lack of Vitamin D is one of the reasons older people have weaker immune systems and why the elderly die in larger numbers in the Winter. It shouldn’t be a surprise, given that the Sun is the source of all Life on this planet. Of course another reason that the elderly have weakened immune systems, is that they are being withheld from their loved ones………