This may be one of the few old tales that actually still rings true.
Carrots are a particularly good source of beta-carotene, fibre, vitamin K, potassium and antioxidants (1).
Vitamin A is converted in the liver from beta-carotene which carrots are packed of! In fact that's where beta-carotene gets its name. This little beauty acts as an antioxidant to repair cell damage done to the body through regular metabolism. In short, it help slows down the ageing of cells and helps rebuild them after exercise. It also keeps your skin glowing and yes! eating carrots has been linked to helping you see in the dark.(2)(3).
Carrots also have a really low glycaemic load, meaning they won't spike your blood sugar levels after eating them. This is particularly good for diabetics and anyone else who finds themselves getting hungry mid-afternoon.