Does feeding your cat pixie sticks have any long term effects? Strange question? Yes. But we did it.?

Here's the story. He looked hungry, so I offered my cat a pixie stick. After two mouthfuls he ran away. For a little while he went absolutely spazztic. My friend says he'll have a heart attack because he's only seven months old. I hope this is not the case. However, that has nothing to do with this question. For the sake of our poor little Felix, please answer quickly in case treatments for sugar highs are needed.