21 lifestyle changes to make if you want to save more money

When it comes to getting rich, the formula is simple: Spend less and save more.

That's easier said than done. To save a considerable amount of money, you have to make more than an intermittent effort. You have to make a lifestyle change.

What kind? We rounded up 21 lifestyle changes anyone can make that could save you hundreds, or even thousands, each year:

SEE ALSO: 9 strategies to become a millionaire, from everyday people who have done it

Record all of the money you spend.

"Write out all of your spending and analyze it," explain Jeremy Jacobson and Winnie Tseng, who retired in their 30s with multimillions in the bank. "Track your dollars. I guarantee you'll find something that either you didn't know you were spending your money on, or you felt was unnecessary."

It's worked for other everyday "millionaires next door," helped one family of four live comfortably off $14,000 a year, and is highly recommended by financial adviser and bestselling author David Bach.

If you don't want to keep a spreadsheet on your computer, consider an app that will automatically track your expenses for you (Mint, You Need a Budget, and LearnVest are popular options), or write them down in a notebook.

Go homemade.

Restaurant bills add up quickly — the more food you can make at home, the better off your food budget will be. Plus, making your own meals tends to be healthier than eating out.

Try cooking large quantities on the weekends so you'll have leftovers to pack for lunch during the week. Also, consider investing in a crock pot. Crock pot meals cost around $2 per person, while the average takeout dinner or restaurant meal costs upwards of $50 for a family of four — this means you could save tremendously if you traded in a crock pot meal for take-out once a week. 

Grocery shop on a full stomach.

Danielle Wagasky, who spent five years stretching $14,000 a year to cover her family's needs and managed to cut her grocery bill from $800 a month to $400, recently shared her top tricks for slicing your grocery expenses.

"First, go shopping on a full tummy," she told Business Insider. While seemingly harmless, shopping on an empty stomach can be an expensive habit. Everything — particularly junk food — starts to look delicious, and without realizing it, you're tossing all sorts of unnecessary items into your cart.

Try eating a healthy snack before heading to the store so your cravings for processed, packaged foods aren't out of control. Your budget — and waistline — will thank you.