3. Anything that’s fat-free is calorie-free

Namkeen and biscuit packets with the words 'FAT FREE' emblazoned on them are everywhere and innocent people are falling into their trap as we write this! Remember, calories also come from sugar and carbohydrates so don't go munching on those fat-free biscuits in the belief that they're harmless.

Do read the nutrition label before buying something 'healthy'.