Home > Diet and nutrition > Healthy Food > Vegetables Updated 27 February 2013 Cos lettuce Cos lettuce is linked to a reduced risk of cancers. It is also a good source of folate and helps to protect against age-related macular degeneration. 0 Vit & Min doses per day » Count calories in food » Is my vegetarian diet balanced? » Ask The Dietitians » Cos lettuce is linked to a reduced risk of cancers. It is also a good source of folate and helps to protect against age-related macular degeneration. The dark outer leaves are the richest in carotenoids. Cos lettuce must be refrigerated and eaten as soon as possible, as the vitamin C content reduces the longer it is kept.These can be eaten freely as they have a low calorie content. Calories 16 Fibre 1,2g Potassium 220mg Folate 55mcg Per 100g NEXT ON HEALTH24X Gordhan confirms: 'Sugar tax' coming later this year 2017-02-22 15:11 More: Healthy FoodVegetables advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... From our sponsors How to care for your vaginal flora Live healthier Hello? » SEE: Interesting facts about hearing loss Earworms: Let it go Is it bad to sleep with earplugs all the time? SEE: Do women hear better than men? The reason why men often appear not to be listening could be because they actually can't hear you. Confident smile? » Acidic drinks can harm your kids' smiles The facts on bleaching your teeth Am I taking good care of my teeth? Why are my teeth stained? We know the rules – brush your teeth twice a day and floss to keep them healthy. But, have you ever wondered what causes those stains that sometimes appear?