As long as you are feeding it as you would with any other house plant food then i cant see why it would. Unless that is all your giving it every day or every time you water. I would think a bit every few weeks like plant food and then water with plain water as normal

I'm wondering what you mean by 'fizzy pop' precisely. Since carbonated drinks consumed frequently and regularly are, in fact, harmful to human beings (particularly cola type drinks), I see no reason to suppose there won't eventually be the same deleterious effect on a potted plant. Rather depends on which fizzy you're using and, as in the previous answer, whether you're watering with water as well and feeding with something useful.

Don't be surprised if there are lots of litle flies coming out of the compost!!

There was a discussion on GoY earlier this month, or possibly last month, when a member asked about feeding with cola. The general consensus was that this is not good for the plant and is likely to encourage aphids who are after the sweet liquid. I would never consider consuming any of the cola type drinks and certainly would not use them as a plant feed. Try Baby bio or any other indoor plant food from your local GC or nursery.

Some cut flowers last longer in diet lemonade...I got that tip from a nurse who had a ward full of perfect flowers.

That's cos it sterilises the water, Pimpernel, its the preservatives - aspirin does the same job in cut flowers. Not necessarily an effect one would want in a plant pot though, kills off good and bad.

Kelly, unless you are using diet pop, the sugar would make it grow faster, and I can recommend this for plants recovering from problems. For most plants, though, there are problems from long term use of sugar, including fungus diseases and fungus gnats, as Volunteer says.