It may seem obvious. I mean we all know it; we've been told for years. We should all be drinking between 2 and 3 liters of water a day. It makes sense as after all, humans are made up of around 60% water.
Most of us would consider our sight to be one of the most important senses, and fear the impact that sight loss would have on our independence. But eye health, in comparison with other diseases, is still largely neglected by medical research funding.
Research can make a huge difference, 25 years ago a corneal transplant had a 50/50 chance of success - now it has a 90 percent chance. Cataract procedures are now routine, laser eye surgery is nowadays a very safe procedure - but that is only through years of research.
Skiing for my country during the Sochi Paralympic Games was one of the proudest moments of my life, but it is not an opportunity I would have had were it for experiencing one of the most frightening experiences a person can go through - losing your sight...
For every blind or partially sighted person you see getting on with their lives, there are many more who are trapped inside their own home, afraid to leave the house and reliant on friends, family and carers to carry out the most basic of day-to-day tasks.