Jam is a more natural alternative and better tolerated by diabetics. Jams are a classic way of preserving fruit, which allows you to enjoy its properties at any time of the year. Natural jams preserve the fibre, fructose, minerals and some vitamins of fresh fruit, and sweeteners are added to improve their preservation. The plum, besides having an excellent and delicate flavour is rich in bioflavonoids, substances with a great antioxidant power.