Most food that you buy from the grocery store that come in a box, bag or jar are going to have added sugar. The American Heart Association recommends that men should eat NO MORE than 36 grams of sugar per day, and women should eat NO MORE than 20 grams per day.
Americans eat about 20 teaspoons of sugar a day according to a report from the National Health and Nutrition Examination Survey database. One teaspoon of granulated sugar equals 4 grams of sugar and has 16 calories. That makes the daily consumption of sugar at 40 grams of sugar per day with a calorie count of 640.
My recommendation is that serving sizes should have no more than 5 grams of sugar and that overall sugar consumption should come from natural sources like fruit and milk products.
When companies make "healthy" frozen meals they replace the fat and carbohydrates with sugar and/or salt. Making foods in bulk and packaging meals for the week is 100% better than buying frozen meals that are often times also full of preservatives.