Why does the caffeine in coffee make us need to use the restroom, but the caffeine in soda doesn’t, despite being around the same amount of stimulant?

Question

Edit: I do not usually drink colas, I prefer clear sodas.

Mountain Dew is my favorite. When I think of having a Mountain Dew, I usually think of the 20 oz bottles. I don’t keep soda cans in the fridge.

When I have coffee I usually have the normal 12 oz over ice.

12 oz of coffee is more or less 100 mgs of caffeine. 20 oz of Mountain Dew is more or less 100 mgs of caffeine. This is why I said, “about the same amount of caffiene,” in my title.

I understand the confusion, and appreciate y’all caring enough to try and correct me in the comments. Hopefully this cleared some things up!

In: 127

Answer 1

Faulty premise.

20 oz. of Mountain Dew has about 90 mg of caffeine.

12 oz. of Dunkin Donuts coffee has almost twice that, at between 150 and 180 mg.

12 oz. of Starbucks coffee, depending on the roast, can be anywhere from 200 to 275 mg.

Even preground highly processed stuff like Folgers is probably 120 to 160 mg in a 12 oz. cup. Folgers half caff has almost as much caffeine in a 12 oz. as Mountain Dew has in a 20 oz.