Yes. Cold showers (and that means as cold as you can make em) stimulate your immune system and activate your brown fat cells who in this artificial environment in which we're never cold lie dormant. Brown fat activates just before you start shivering, it heats up the body by burning calories and helped our ancestors survive situations where they could just turn up the heat. There's a cool book on this: "What doesn't kill us" by Scott Carney. It's about Scott, a journalist, being sceptical of the achievements of Wim Hof (the dude that takes hour long ice baths) and visiting him to prove that he's a false prophet.
I once spent almost a year only taking cold showers. It sucks big time for ten seconds and then your body adjusts and you're actually quite comfortable (seriously, try it. Pretty amazing feeling). Wish I hadn't stopped, but come winter hot showers just became too enticing :D
Very much not full of it. The author ends up being completely convinced and even climbs a mountain with Wim Hof while wearing nothing but short pants.