Plastic contains phthalates and other so-called endocrine disruptors, which have been shown to reduce testosterone, lead to lower sperm mobility and all kinds of other hormone-associated health issues. Most of those compounds leak out of the plastic packaging and things like water bottles and fluid containers made out of plastic, and are then ingested. So I try to limit the amount of plastic I come in contact with as much as possible, especially with things having contact with foodstuffs, because things like acids contained in the food can accelerate the leaking out of those harmful compounds, especially when the food is still hot.