When it comes to calories, it's common knowledge that the average woman needs around 2000 a day to maintain her weight and energy levels - but it's how you 'spend' those calories that can be a more difficult concept to swallow.
Which is why wisegeek.com has broken down exactly what a 500 calorie snack looks like, regardless of its nutrional value.
Disclaimer: images are only an approximate guide.
Snickers chocolate bar
41 grams = 200 calories
Apples
385 grams = 200 calories
Avocado
125 grams = 200 Calories
Hard boiled eggs
150 grams = 200 calories
Sesame Seed Bagel
70 grams = 200 calories
Ready salted crisps
37 grams = 200 calories
Peanut butter
34 grams = 200 calories
Blueberry muffin
72 grams = 200 Calories
Celery
1425 grams = 200 Calories