For most of us, our early 20s are but a distant memory.
A time when we could eat whatever we wanted and still be in pretty good nick.
Adjusting to life with a slower metabolism can be tough - but there Amazon have just started selling a new product that may be able to help you.
Introducing the Pavlok Bracelet. It's a bracelet designed to help you break bad habits by delivering an electric shock every time you do something bold.
And it's not limited to bad food. It can help you stop smoking or stop biting your nails.
The makers of the Pavlok bracelet describe it as "your natural and lasting solution to quitting smoking, nail biting, hair touching, negative thinking, procrastinating, eating sugar, and more."
A bit extreme? Maybe, but we'll try anything once.
And, if you struggle to get out of bed in the morning, the company also sell a product called the Shock Clock which is about horrific as it sounds.
It's an alarm clock that "trains your brain" into waking up on time with gentle shocks. It also includes a feature which forces you to do jumping jacks or leave the room to turn the alarm off.
The Pavlok Bracelet has been on the market for a while but has only recently been added to Amazon's ever expanding product list.
The bracelet will set you back around €220 but as they say: no pain no gain.