A recent small study tested 10 different frozen meals for calorie count and found three were higher than the boxes claim.
University researchers found Weight Watchers Lemon Herb Chicken Piccata had 21% more calories than listed on the package.
Lean Cuisine Shrimp and Angel Hair pasta had 28% more.
And Bell and Evans Grilled Chicken Breast had 31% more.
"The calories are on the box and you eat them thinking you have the right number of calories and then you don't lose weight. You will blame yourself eventually," said Susan Roberts, Professor.
Food manufacturers point out researchers only tested a single sample of each product.
Manufacturers themselves are required to test at least a dozen samples as proof for their labels.
But packaged foods are allowed to have 20% more calories than the label lists.
