It's one of the most confusing things you face when trying to shed excess pounds.
For those looking to eat healthily, deciphering portion sizes can sometimes be a minefield as visualising just how much of certain foods you should be eating can be difficult.
But as confusing as they may be, keeping them in check is one of the key ways to prevent obesity.
Experts have said that a lack of portion control is one of the main reasons people are overweight – with many of us eating far more than we should be.
However there is now a simple way to keep an eye on how much food you're consuming, with FEMAIL's food portions graphic.
Our research shows that one ounce of cooked rice is the same size as a tennis ball whilst the same amount of cooked pasta should be able to fill a cupcake wrapper.
The comparison data, which was published by McKinley Health Center, University of Illinois, US, has a list recommending portion sizes for various foods, which includes size equivalents for bread, pasta, snack foods, and fruits.
The next time you reach for the grapes, bear in mind that 15 grapes is the size of a lightbulb.
A portion of raisins is equivalent to one large egg whilst one ounce of cheese is the same size as a 9-volt battery.
When it comes to cooked meats, three ounces of beef, fish or poultry should be the same size as a deck of cards.
And three ounces of grilled or baked fish is the similar to the size of a chequebook.
Indulging in a Sunday roast? A cooked chicken leg, thigh or breast weighs three ounces.
When snacking, use your hands to measure just how much you can have.
Half a cup of crisps, crackers or popcorn is the size of a man's handful. To opt for less of the same, one-third is the same size as a woman's handful.
