While tracking your spending is a good idea, if you really want to get serious about saving both money and calories, create a budget. And when it comes to staying on task, cash is king.
"Take a stack of envelopes and mark them for items you need/want to purchase—groceries, gas, entertainment, and utilities. Put an established amount of cash in each envelope and once it's gone, it's gone. This will make you find a way to budget and make things work," says Amanda Gift, managing principal and vice president at Signature, a multi-family wealth management firm.
Sticking with cash can also help you make healthier choices at the grocery store. One 2010 study from Cornell found that people who paid for their purchases with credit cards were more likely to impulsively buy unhealthy items like ice cream and chips.
The same goes for calories. Getting specific about your weight-loss goal can help you determine your weekly calorie limit. Plan ahead for extra "spending" if a special event is coming up by cutting back on alternate days.
Take action: Once you've determined your monthly budget, spend some time on a Sunday to plan out healthy meals for the upcoming week to stay within your financial and calorie budget. (And when it's time to hit the grocery store, bring only cash!)