Library.

“Drinking warm water hydrates human cells more effectively than drinking cold water.”

No credible scientific evidence supports the assertion that warm water hydrates human cells more effectively than cold water. The only controlled human studies in the evidence pool found that cool (~16°C) water produced better overall hydration outcomes through higher voluntary intake and lower fluid losses. Claims favoring warm water rely on speculative mechanisms from non-peer-reviewed blogs and brand websites, none of which directly measured cellular hydration. Scientific consensus indicates water temperature has no meaningful effect on cellular hydration efficacy.

“Approximately half of the cells in the human body are non-human cells, primarily composed of microorganisms such as bacteria.”

The claim is largely accurate. The best peer-reviewed research (Sender et al., 2016) estimates ~38 trillion bacterial cells versus ~30 trillion human cells, making bacteria roughly 56% of all cells — reasonably described as "approximately half." However, this is a point estimate for a 70 kg adult male with significant uncertainty (~25%) and population variation. The claim also omits that by mass, bacteria account for only ~0.2 kg, so "approximately half" applies to cell count, not biological dominance.