The NHS in the UK recommends that adults should have no more than 30g of free sugars a day, (roughly equivalent to 7 sugar cubes).

"Eating too much sugar can make you gain weight and can also cause tooth decay."

Within their tips to reduce sugar, they specifically recommend to use low-sugar jams: 
"Rather than spreading high-sugar jam, marmalade, syrup, chocolate spread or honey on your toast, try a ... reduced-sugar jam or fruit spread, sliced banana or lower-fat cream cheese instead."

See all low-sugar jams on mortaste.ie

Learn more about sugar consumption and read the full article of the NHS here.