The reason it has 0 calories (technically not 0, but due to laws its close enough to 0 that it’s allowed to say 0) is because the chemicals that make it sweet arent properly “digested” by your body, meaning they dont become fuel (aka, calories).
So yes, just like sunbathing in front of a picture of a sunny beach won’t give you a tan, drinking something that isnt converted into calories by your body won’t make you gain weight.
HOWEVER, there are studies linking sweetened drinks to higher hunger and/or thirst. So while the drink itself wont make you gain weight, it **could** cause your behavior to change so as to be more likely to gain weight via other methods.
It might be more difficult to maintain a calorie deficit while drinking sweetened (and suger free sweetend) drinks as they can affect your appetite, sometimes making you more hungry. Coke zero on it’s own…not really going to affect your calorie intake. There has been debate about sweeteners affecting your insulin levels but I don’t know what the modern research shows on that, it might only be a thing for diabetics if at all
Or you could just drink water. You’d avoid all the dodgy chemicals, save money and the planet and … it really has what plants crave.
But there’s more to a diet than sugar and chemicals. You need protein to repair your parts, fibre to keep the slurry moving and wipe the pipes clean, and all the vitamins and minerals to make the chemistry work.
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