In case you didn't see the posts in Media Watch:

25% = 125g of Refined Sugar. That is:
5 Twinkies;
3-4 Sodas; or
5 Candy Bars

10% = 50g of Refined Sugar. That is:
2 Twinkies;
1-2 Sodas; or
2 Candy Bars

These figures are based on a 2,000 calorie diet. If you go with a 3,000 calorie diet:

25% = 188g of Refined Sugar. That is:
7-8 Twinkies;
4-6 Sodas; or
7-8 Candy Bars

10% = 75g of Refined Sugar. That is:
3 Twinkies;
2-3 Sodas; or
3 Candy Bars