Here are a few ways start.
Keep a record of your physical activity. Most people overestimate how much exercise they get. If you write it down, you’ll have an honest appraisal of where you’re starting.

Bring your own lunch. Try to avoid eating lunch at restaurants or fast-food joints. That’s because restaurant meals “can go out of control easily,” Savoca says. They tend to have large portions, lots of calories, and high amounts of fat.

Research has found an association between eating out more and having a higher body weight. When you make your own lunch, you control the ingredients and your portion sizes. If making your own lunch every day is too much, you might want to try twice a week to start. Bring a cup of homemade black-bean soup that you can heat in the office microwave, or stuff a whole-grain pita with veggies and chicken.

Change your daily routine. Instead of stopping for a fat-filled latte on the way to work, have a cup of coffee with low-fat milk and a low-fat granola bar.

Make healthier choices when you go to restaurants. For example, at McDonalds, a diabetes-friendly choice might be a salad with grilled chicken and low-fat dressing. “What’s important is for people to be able to problem-solve,” Savoca says. “People probably have a lot of the answers, it’s just that it takes a little time to come up with them and make them their own.”

Use a pedometer. These handy devices—available for less than $20 at sporting goods stores—clip on to your waistband and record the number of steps you take. Use one to estimate how many steps you take on an average day. Then set a goal to slowly increase that number. Maybe you want to take 100 extra steps every day this week, and add another hundred each day next week. Although many experts recommend going 10,000 steps a day for good health, feel free to set goals that work for you, Goebel-Fabbri says.

Keep gum handy. Pop a piece of sugar-free gum (but not too many pieces—some sugar-free gums contain sweeteners that can upset your stomach at high doses). Gum may “fix” your need for a snack and leave you with a fresh, minty taste that you won’t want to ruin with a bag of sour cream and onion potato chips.

Try one new type of fruit or vegetable each week. With the variety available at the typical supermarket, this strategy could introduce you to new favorites for months.

Take home menus from your favorite restaurants. You can research the healthiest options on the menu when you’re not rushed to make a decision. Decide what you want before you go into the restaurant and order ahead of your dining companions so you won’t be tempted by their choices.

Serve homecooked meals on smaller plates. Portions matter. If you serve yourself less food, you tend to eat less than if you have a large plate with a large meal.

Test your blood sugar two to three hours after meals. Hardy frequently tests her blood sugar with a glucose monitor. With time she slowly figured out which foods made her blood sugar jump up too quickly. Sometimes her blood sugar gets too high, but she doesn’t get down about it—she just aims to do better. “Know that you’re going to make mistakes and know that’s OK,” she says.

For more information  10 Small Diet and Exercise Tricks

Park and Walk
Whenever you have an errand, park your car as far away as you can handle and walk to the store. At the mall, park at the farthest end and walk the length of the mall. Use every opportunity to walk. At the end of the day, it all adds up to better fitness.

Crunch in Bed
Before you even get out of bed in the morning, do 10 stomach crunches while lying flat on your mattress. Increase daily by one until you get up to 100. Think you’ll never get there? Try it. You may eventually have to set your clock to wake up 15 minutes earlier, a small price to pay for a flatter stomach.