As we get older, gravity and thinning skin, as well as factors such as B.reastfeeding, inevitably lead to B.reasts becoming less perky than they once were.

But there are a number of bad habits you could be guilty of that are contributing to their journey south, according to Dr Dirk Kremer of Harley Street Aesthetics.

The leading plastic surgeon told Glamour that a number of habits that you might not immediately recognise as risk factors, such as failing to apply sunscreen and sleeping on your stomach can all contribute to sagging.

And while you might imagine that going Br@less could have a negative impact on perkiness, that’s not always the case.

Read on to find out how many mistakes you’re guilty of, and what you should do to correct them.
DON’T: Sleep on your stomach 

Pressing your B.reasts against the mattress for hours on end won’t do them any favours, while lying on your side will cause the ligaments to stretch over time.

If you want to maintain uplift in your cleavage, then sleeping on your back is the best position.
DON’T: Rely solely on high impact exercise

According to Dr Kremer the research is not conclusive, but some experts believe that ‘back-and-forth repetitive motions that happen when you run or do a similar workout can lead to a breakdown of B.reast collagen.’

If you want to be on the safe side, alternate between sports such as running and lower impact exercise like swimming and yoga.

DON’T: Wear a bra all the time

A study by French researchers found that constant support can weaken chest muscles and make the B.reasts sag.

However, going Br@less all the time is likely to have the exact same effect.

The best approach is to give your B.reasts a break now and again and ditch your bra.
DON’T: Skip sunscreen 

UV rays will stretch out collagen and damage the skin, leading to the dreaded sag.

DON’T: Crash diet 

Every time you gain and lose weight, the B.reast tissue will become more slack.

DON’T: Smoke 

Even if it’s just a few cigarettes, any smoking decreases blood supply to the surface of the skin, which will weaken and age it.

What causes B.reasts to sag? 

No other part of the body is more affected by the force of gravity than the B.reasts.

From the moment a woman’s chest is fully grown, in her late teens to mid-twenties, there’s a battle against the downward pull.

While an average pair of B.reasts weighs around 2lbs to 4lbs, there’s not much of a natural support structure to keep them in place.

The condition even has its own medical name — ptosis — and droopiness can be graded by doctors on a three-stage scale.

In pert, young B.reasts, the nipple is usually above the line where the base of the B.reast meets the chest — or the inframammary fold.

By stage two, the nipple is around one to three inches below that point.

At stage three, the B.reast hangs more than 3cm below, with the nipple often pointing down to the floor.

Over a lifetime, a woman with heavy B.reasts may see her nipples drop by as much as ten or 11cms if they descend to her waistline.