Advice please! Looking to study Nutrition as a Masters - aberdeen/ UCL/ London Met?


Hi guys1
looking to study Nutrition as a mature student.
currently working part-time but would like to change career to become a nutritionist. im attracted to the aberdeen MSc as its online however the London Met has received high praise for its teaching in Nutrition. UCL also do an interesting course in Obesity and Nutrition.
please does anyone have advice re entry prospects and the actual course (s)
i have an MSc in Microbiology and a diploma in Dental hygiene.
Thanks in advance