If you’re already consuming a lot of sugary drinks then switching to diet would probably help you lose some weight. The energy aspect might make you a little less hungry during the day, but all that caffeine isn’t really doing you any favors beyond that.

Irrelevant for the weight loss itself, but if it helps you eating less, why not.

I’m not an MD but I would say having one now and then isn’t going to hurt you, but they are not at all a tool for weight loss even without sugar. Weight loss is primarily achieved by reducing calorie intake, and drinking a zero calorie drink doesn’t reduce calorie intake. The caffeine will not do enough to suppress appetite to be effective. Other people with more credentials say a similar thing: https://goaskalice.columbia.edu/answered-questions/can-energy-drinks-help-me-lose-weight.

I’d be concerned about frequent caffeine consumption impairing your sleep.

Generally though I’d avoid your current thinking. There is no safe, easy way to cheese weight loss. Calories in < Calories out. Ozempic or LAP bands are the closest you’ll get and even these are a huge stress on your body and in my area require Doctor consent.

Small incremental changes towards healthier behaviours are the way to go imo. Drink a coffee every morning with 2 sugars? Cut it to 1. Donut for breakfast? Make it a bagel with cheese. Swap that bagel for yogurt and granola eventually. Forgo soda (this 1 is huge if you can pull it off) and drink juice/iced tea/flavoured water/etc… Park at the back of the lot and walk the extra distance. Take a flight of stairs every second day, then 2 flights, 3, then every day, and so on… Small lifestyle changes are simple, will give you gradual results that you will notice and have a greater chance of sticking (sudden weight loss inevitably returns except for extraordinary effort).

They absolutely can and their method of action is multi-faceted but they are a minimal benefit at best.

1. Caffiene is a stimulant, you are more inclined to move when stimulated both planned, unplanned and it will provide an uptick in your BMR by simply making your heart beat just a little faster and you figeting more.

2. There is SOME evidence that caffiene can suppress appetite. Personally I dont put much stock in this, I think if you shotgun 500ml of any liquid you are likely going to feel less hungry but people smarter than I think it might.

3. You’re more likely to exercise if you dont feel tired. Caffiene masks fatigue and tiredness it doesnt remove it but psychologically you’re more likely to get up and go do something.

4. Its a essentially calorie free replacement for other drinks. If its replacing a caramel double shot frappe with whipped cream…

Now theres some caveats…

1. Sleep is second only to diet when trying to lose weight, there is numerous studies on low sleep basically dragging weight loss to a halt and causing muscle loss. Caffiene can really screw with sleep… so timing is very important. Personally 3pm is my hard cut off for caffiene because I get up for work at 5am and caffiene has an approximate 6 hour metabolism rate, so for me to get 8 hrs I need to be trying to get to sleep at 9.

2. You build a tolerance and a dependence fast. Dont expect to feel much after a few weeks and expect to have a few cranky days if you put a stop to it. I gave up on this years ago, I consume about 500mg a day.

3. Can be risky in the heat, caffiene is a diuretic. It makes fluids want to leave the body, makes your hydration extra important to stay on top of.

4. You CAN overdose, unlikely to kill you unless you just stop giving a shit and pound can after can, but an energy drink then a coffee with a friend, then your afternoon can an bit earlier than normal then a gym friend says “hey you want some preworkout?” And you will have an absolute blocksplitter of a headache.

I start my day with a can first thing in the morning and then another about 8 hours later to prop me up for the afternoon. Outside of that its mostly a few coke zeros here and there. But this is all on top of a calorie restricted diet and 4 to 6 days a week going to crossfit. Drinking sugarfree monsters doesnt count as dieting, its not health food, its just another little thing you can do that might help add up to better results over a long enough time period.

Stimulants generally make you less hungry. I think other stimulants are far more effective, but caffeine will probably help a bit.

absolutely not.

sugar intake . high blood sugar - high insulin when insulin is high, fat burning is blocked. but fat storing is ramped up.

so you are smart and drink the sugar free version.

artificial sugar intake, blood sugar stays low, insulin gets high regardless fat burning is blocked, fat storage is ramped up.

so dont drink energy drinks.

what you can do:

drink and eat anything vinegar. eat vinegar cucumbers for example, and drink the water they swam iside in. you can burn the acetatic acid in your cells instaed of sugar.

so you will have a little bit of energy, with out the whole fat blocking spiel.

and the little energy boost helps HUGELY against cravings.

scientific explanation:

look up acetatic acid metabolism.

ever wondered why alcohol gives you energy? thats the reason.

drink water.

milk has almost the same amount of sugar as coke. dont drink almond drinks, dont drink soya drinks, dont drink protein shakes.

they give you a little bit of protein while making you hat. its not worth it.

ever ate pure plant protein without sugar, flavouring, artificial sugar?

you cant, it will make you puke.