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TIFFANY ELIZALDE & TINA MARIE KONEGNI

They started dieting together

From playing volleyball to volunteering at their church to, yes, gaining weight, Downey, Calif.-based twins Tiffany and Tina Marie, both 31, always did everything together. "In third grade we were both 150 lbs.," says Tiffany. "We were always the biggest kids." In 2008 their growing girth finally took a toll: At 5'5" and almost 300 lbs., Tiffany saw her blood pressure skyrocket, causing her to black out at the school where she works. Her sister-who weighed 276 lbs.-rushed her to their doctor, who said they wouldn't live to see their 40th birthday. "Our health was in the dumps," says Tina Marie, who decided to join Weight Watchers with Tiffany in January 2009. Since then Tiffany has lost 153 lbs. and is helping Tina Marie reach her goal (she has 3 more lbs. to go!) with their daily 8 to 10 mile walks. "It's easier if you have someone to root for you," says Tiffany. "We felt trapped in these fat bodies. Now they're not holding us back."

TINA MARIE BEFORE 276 LBS.

TIFFANY BEFORE 298 LBS.

TIFFANY NOW 145 LBS.

TINA MARIE NOW 153 LBS.

MICHAEL REINER & JOANNA SCHRAGER

Her weight loss inspired him to eat healthier

Growing up the biggest girl of the family wasn't fun for Schrager. "Both my sisters are very thin, so I felt silly just walking with them," says Schrager, 23. College didn't help either: "Girls would run around in their towels, and I felt uncomfortable," says the education student. That is, until she signed up for Jenny Craig in '06 and lost 170 lbs., thanks to a new commitment to daily exercise and portion control. Her change inspired her brother-in-law Reiner-a lawyer and admitted "comfort food eater"-to also give the program a try. "For dinner I would have a burger, hot dog and a steak!" says Reiner, 29, who dropped 35 lbs. by cleaning up his diet. "Now my wife [Fanni, 29] makes a chopped salad for the week." Schrager adds a side of support: "We encourage each other because we're going through the same struggle."

BEFORE 250 LBS.

MICHAEL NOW 215 LBS.

BEFORE 318 LBS.

JOANNA NOW 148 LBS.

GRACE & MARTY MOOREHEAD

They want to live into their golden years

Whenever Marty caught a glimpse of himself in the mirror, "I'd go, 'Man, look at those three chins!' " he says. "I hated seeing my reflection." That didn't stop the self-professed "pizzaholic" from putting away six slices in one sitting or indulging in late-night burger runs. By 2008 he was so heavy that a doctor suggested bariatric surgery. "I did a lot of soul searching," says Marty, 56, who finally decided, "I love my wife and I don't want to leave her before I have to." But instead of going under the knife, Marty started Dr. Siegal's Cookie Diet-a meal plan that consists of six 90-calorie cookies a day and a 600-calorie dinner. As she watched 182 lbs. disappear from her husband of 33 years, "he inspired me to get on the bandwagon!" says Grace, 55, who also lost 51 lbs. by forfeiting bread and pasta and going on four-mile walks four times a week with Marty around their Gilbert, Ariz., neighborhood. "Now we can do more together," says Grace. "And we'll be around a lot longer."

GRACE NOW 147 LBS.

BEFORE 205 LBS.

BEFORE 363 LBS.

MARTY NOW 181 LBS.