Many retirees spend years worrying about running out of money.
But financial advisors say another risk often goes unnoticed.
Some retirees spend too little and fail to fully enjoy retirement.
"Overspending is risky.
But underspending is risky too," financial advisor Zach Teutsch told CNBC, arguing that some retirees become so focused on preserving their savings that they miss opportunities to enjoy the money they spent decades accumulating.




