Dr Michael Mosley has shared some of the things he does and eats in order to speed up his metabolic rate, which are all simple enough for us to add into our daily routines.
Dieting guru and author of the hugely popular Fast 800 books, Michael is no stranger to sharing his weight loss advice online amongst fans and helping them to reach their goals.
Often, people reach out and ask him for help with specific issues they're having - such as still putting on weight despite eating a healthy and balanced diet.
Michael says that when you experience this problem, the issue could be that your metabolism has slowed down.
And to help speed it up again, the doctor recommends a few different steps including consuming more protein, spicy foods and green tea - as well as doing resistance exercises like push-ups and squats.
That specific type of exercise helps to burn calories even when you're sleeping so is ideal for weight loss.
Writing in a column for the Daily Mail, the diet guru explained that over the past 40 years or so, metabolic rates in the UK and other countries have significantly slowed down.
Referencing a recent study by the University of Aberdeen and the Chinese Academy of Sciences in Beijing, Michael revealed that men are burning about 220 calories less a day and women 122 calories less, compared with what people the same size and shape would have done in the 1980s.
This study goes against what many people think about exercise rates nowadays, as it says we actually do it more and burn more calories than back then.
Michael wrote: "To the scientists’ great surprise they discovered, instead, that basal metabolic rates (i.e. the calories we spend just staying alive) had dropped, which explains the big fall in total energy expenditure.
"They believe one reason for this is the major change in what we eat, with a drop in consumption of meat and dairy (which are rich in saturated fats) and a rise in ultra-processed foods high in sugary carbs. For years we were urged to reduce consumption of saturated fats because this was supposed to cut our risk of heart disease, though the evidence for this has never been that strong."
Similarly, switching to a ketogenic diet is also something Michael says can help boost metabolism, as it's higher in fat and lower in carbs.
As well as this, another possible reason for the drop in metabolic rates could be because of the central heating in our homes.
According to Michael, because our indoor temperatures used to be lower, we had to burn more calories to keep our body's core temperature at a normal level.
He added: "On the plus side of this, one of the adaptations that naturally occurs when you are living in a chillier house is your body produces more brown fat — this type of fat is packed with mitochondria, tiny structures inside your cells that act like mini power stations, turning food into energy. The more brown fat you have, the higher your metabolic rate."
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