But getting thinner is another story

Weighing yourself in the morning before you’ve had anything to eat is the oldest trick in the book when it comes to giving yourself a quick and easy self-esteem boost.

But, check back at the end of that same day and you’ll most likely find the numbers on the scale aren’t going to be the same.

So why is this?

Science says our body weight can actually fluctuate as much as 2.5 kilograms a day.

Most of these changes are down to bodily functions like eating, drinking and going to the bathroom.

On average, about 52 to 55 per cent of women’s body weight comes from water, while it’s about 60 per cent for the average man.

Which is why we’re supposed to drink up to nine cups of water per day because not only is drinking water essential to good health – and totally necessary for your body to function properly – it also replenishes supplies to the most plentiful part of your weight.

If you get sick from something like food poisoning you can expect to lose close to four litres of water a day through severe vomiting or diarrhea (so gross, we know).

That could drop your weight a bit lower until you get rehydrated, since those lost litres can equal nearly 3.6 kilograms in weight.

It’s normal for weight to fluctuate though, so there’s no need to worry if the scale says a higher number than you think it should.