Can jam coated with jam be eaten without poison? Jam is a sweet food with a calorie of about 252 calories/100g. It is a high carbohydrate food and should not be eaten more when losing weight. Jam is mainly rich in sugar. There are many sugars and high relative calories, but the fat content is not high, only 5 grams at most (per kloc-0/00 grams). Jam has a high sugar content and should not be eaten, especially for diabetics.