When my wife and I started we just went through the cupboard and off loaded anything greater than 3grams per 100grams. We also look closely at the ingredients list.
So apart from the obvious chocolate etc all our sauces, dressings etc have been moved on.
We make our own salad dressings from olive oil, lemon juice (we eat the rest of the lemon peel and all) and rice wine vinigar. we make our own avocado dips and roast pumpkin dip.
Having been on a low salt diet for years and achieving nothing health wise we now have removed 99% of sugar from our diet and have been losing weight and feel very good.
We do not have cravings and do not miss sweet stuff at all. So look at the labels, if it is over 3g/ml per 100g/ml then don't use or eat it.
Or as was mentioned 5g/ml per 100g/ml in dairy but look at the ingredients labels very carefully in dairy products, their sneaky buggers they are.
On a label if it says 10% sugar, look in the per 100g side and it will read around 10g per 100.
No idea about how many grams there are in a teaspoon.
Cheers
Wilky