A woman shopping for groceries (stock photo).zhihao/Getty ImagesYouTuber Kate Kaden warned against "blackout shopping," a trend of buying unnecessary items.Kaden promotes frugal living and advises on consistent money-saving methods.She suggests creating a budget, shopping only once a week, and decluttering your house. There's a phrase for going into a store, buying loads of things you don't need, and forgetting to pick up the one thing you did.It's called "blackout shopping," and it's one of the worst things you can do if you're trying to save money, according to Kate Kaden, a YouTuber who gives advice on "frugal living."Kaden is one creator in a movement of many on social media who are encouraging young people to save their money rather than spend it as soon as it hits their accounts.Living below your means is the best way to save money consistently, Kaden told Business Insider.