I am not sure why you want to make something like jam or jelly more healthier!! It is a treat thing. Don't mess with the recipes on this by using less sugar or substituting any synthetic substance for it. If you don't like the sugar in jam you shouldn't be making it. It is almost pure sugar anyway from the fruit juice and pulp. Less sugar may mean it spoils before it is even opened.Use less sugar or use raw sugar which is better for you. Or use honey. With the raw sugar the granule is usually larger so requires a little more time to dissolve. This is what I use all the time when I can. Its brown so my pickles look a little dark, but I don't do competitions or anything. With honey you have to boil down a little more and you still end up with a not as firm jam. But if you use local raw honey thats the best for you. Also you could cut the sugar and sub some stevia in. But stevia is very sweet compared to sugar, so don't sub in one to one.