Scoffing down a quick meal while on the go is common for many, especially for those who have to squeeze their lunch into a 30 minute break.
But some may not realise that a speedy lunch might be the very reason they feel hungry enough to snack before dinner time comes around, warns TV doctor Micheal Mosley.
In a recent blog post, the diet guru's Fast 800 website revealed that eating your food too quickly could be a cause of constant hunger.
The blog reads: "In one study involving 30 women, fast eaters consumed 10% more calories during a meal and reported significantly less fullness, compared with slow eaters.
"The study ultimately found that eating slowly may help to maximise satiation after meals."
Micheal's new blog is referencing a study in which eating slowly led to decreases in energy intake within meals in healthy women.
The post also goes into other potential reasons why you may be feeling hungry, despite having already eaten shortly before.
These reasons include a lack of sleep, which could not only make you hungrier, but also "makes you crave worse food". Dehydration is also cited as a reason as thirst can be mistaken for hunger.
The full list of reasons are:
You’re not getting the right nutrients
You’re not sleeping enough
You’re dehydrated
You’re not eating mindfully
You’re eating too quickly
Despite this advice, fast eating is a key part of Micheal's 800 calorie programme - but this programme is dedicated to rapid weight loss and not feeling full.
The expert's 12-week Fast 800 diet programme involves eating food at set times of the day, and in some cases eating food very quickly.
It mostly involves a Mediterranean diet, which Micheal has been a long time proponent of, and contains a lot of fruits, vegetables, seafood, beans and nuts.
Micheal's website calls the diet: "A short-term rapid weight loss phase used as a kick-start to improve metabolic health until a healthy weight is achieved, or for up to 12 weeks."
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