Kill it now! Kill it with fire!

Maybe instead of "advising" you tell your daughter no coke before bed. You are the parent. Tell her she can't do something and enforce it so she follows through. "Advising" will do nothing.

Despite the fact that she's worked out that uppers and downers can cancel one another out, you can try a different argument: It's really bad for her teeth. Coke contains phosphoric and carbonic acids, which destroy enamel. This can be countered by brushing one's teeth with a fluoride containing toothpaste (fluoride ion replaces the hydroxide ions leached from teeth by acids and fluoride forms a much stronger bond than the lost hydroxide, making it hard for acid to steal later). However, there's a major drawback to this. You should not be brushing your teeth immediately after consuming a soda because the teeth are in a softened state and the brushing damages the enamel even more by abrasion! This isn't normally a problem if a soda is consumed during the day due to the longer period of time between the last drink and a nightly brushing. However, when a soda is consumed at night then she'd have to spend at least another half hour awake before she can safely brush her teeth. Obviously, she shouldn't go to bed without brushing after having given the bacteria in her mouth a veritable feast of sugar from coke (which will produce even more acid and damage her teeth all night). This would still be a problem if you buy caffeine free coke (which tastes exactly the same and doesn't cost any more).

use is not the same as abuse

When I was 15/16 I had caffeine pills under my bed and my parents took them, and grounded me for 2 weeks for having "drugs". I explained that they were just caffeine and they still got mad and I can understand that. If I had said something like that to my mom I would've been in the shit.

I don't believe I've ever heard of Aspirin for your heart, ma'am.

I've done so much worse than this.. But I'm not an addict. I've got months without Mountain Dew or any kind of caffeine with no side effects of stopping. Even after drinking half a liter to two liters a day. Yes I know it's not healthy but I don't give a damn. It's my body and I can do what ever I please with it.. Mostly. I don't do drugs or anything, but I have been known to drink a bunch of Mountain Dew or energy drinks, and then realize I need to go to sleep, so I'll pop a quick sleeping pill. It's not a regular thing, but I do it from time to time. No addictions or anything. If I had to, I could stop just fine, I just don't want to.

Really, 77? It's a fairly common thing. A lot of people take aspirin daily as they get older to protect the health of their heart. It thins the blood and can prevent heart attacks.

Next thing you know she will be trying to balance alcohol with 5 hour energy.

Tons of people take baby aspirin to thin their blood, esp those at risk for a heart attack. They even have commercials "aspirin saved my life after a heart attack"