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VICTORIA BECKHAM

Eating the ALKALINE WAY

Alkaline (or non-acidic) foods are said to be easier on your system.

WHAT YOU EAT

Yes to leafy greens. Limit animal proteins and anything processed.

EXPERTS SAY "Acid vs. alkaline? Doesn't matter," says N.Y.C. dietitian Brooke Alpert. "But the food allowed on this diet is nutritious."

WE TRIED IT!

PRO There's a recipe for chocolate mousse cake! CON Our tester carried a list of approved foods everywhere.

GWYNETH PALTROW

Clean GUT

A 28-day plan that promises to rehab your gut and reverse some chronic diseases.

WHAT YOU EAT

Shakes for breakfast, light meals like Lemon Dijon Haddock—and a staggering 15 supplements a day.

EXPERTS SAY

"While it decreases junk like suspect additives," says nutritionist Joy Bauer, "people may find it extreme."

WE TRIED IT!

PRO Our staffer hasn't craved bread or caffeine since starting.

CON Seven bottles of supplements cost $215!

HILARY DUFF

The BODY RESET DIET

Blend your meals to "reboot" your bod.

WHAT YOU EAT

For the first five days, smoothies for every meal (the "apple pie" blends an apple and Greek yogurt) plus two healthy snacks; then, eventually, mainly solid food.

EXPERTS SAY

"Mostly liquid diets can be a shock for novices," says Rovenia M. Brock, Ph.D.

WE TRIED IT!

PRO Our tester's sugar cravings disappeared.

CON Tough for the lactose intolerant.

BROOKE BURKE-CHARVET

The DIGEST DIET COOKBOOK

Fill up on "fat releasers"—foods, like dairy products, said to shed flab.

WHAT YOU EAT

Smoothies, soup and a 100-calorie snack for four days. Then introduce Mediterranean diet-inspired meals.

EXPERTS SAY

Bauer, a Today Show health expert, notes that research on so-called fat burners like dairy is mixed.

WE TRIED IT!

PRO Easy-to-follow recipes.

CON By day two our tester was "hangry" (hungry and angry).

DREW BARRYMORE

The Beauty DETOX FOODS

Focus on natural foods with specific beauty benefits (pumpkin seeds equal great hair - who knew?).

WHAT YOU EAT

Green smoothies made with a whole head of romaine; zero gluten or dairy.

EXPERTS SAY

"Bravo for plant-based eating!" says Bauer.

WE TRIED IT!

PRO Our writer had glowing skin and stronger nails.

CON Had to hunt for hard-to-find foods, like bee pollen and kelp noodles, online.

MOLLY SIMS

The MIRACLE CARB DIET

The author's mantra: "Fiber and protein at every meal makes losing weight no big deal."

WHAT YOU EAT

Plenty of protein (plus three bites of decadent desserts!). The "miracle" here is at least four high- fiber crackers a day.

EXPERTS SAY

"Eating fiber-rich foods is a healthy way to lose weight," says Alpert.

WE TRIED IT!

PRO Our editor felt fuller longer.

CON It took her days to adjust to all those fiber crackers.

ROSIE HUNTINGTON-WHITELEY

Integrative NUTRITION

This textbook-like tome dissects over 13 diets, including the Master Cleanse and the Atkins diet.

WHAT YOU EAT

Advice ranges from drinking more water to eating less meat and dairy.

EXPERTS SAY

"People will struggle with the lack of direction," says Alpert.

WE TRIED IT!

PRO A collection of healthy recipes.

CON Some New Agey exercises— like writing down goals for New Year's 2015 —felt off-topic.

CHELSEA HANDLER

Body CONFIDENCE

Eat less, more often.

WHAT YOU EAT

Five or six small daily meals (calories depend on gender and body type). Dishes are eaten in this order: protein, then fat, then carb.

EXPERTS SAY

"You get the nutrients you need," says Brock, a nutritionist. "But your body doesn't know what order you eat them in."

WE TRIED IT!

PRO Our tester had more energy.

CON Requires roughly 100 minutes of exercise five days a week.

KANDI BURRUSS

The SHRED DIET

A meticulously scheduled six-week regimen of low-cal options.

WHAT YOU EAT

Four small meals plus three snacks that are 150 calories or less consumed at non-negotiable times in the day.

EXPERTS SAY

"The nutritional advice is sound, but it's not an easy plan to follow," says Dr. Heber.

WE TRIED IT!

PRO Our staffer lost 6 lbs. in two weeks.

CON She found the constant clock- watching stressful.

JENNIFER LOVE HEWITT

The 8 HOUR DIET

Eat all meals within an eight- hour window.

WHAT YOU EAT

Suggested breakfast is water, then anything goes, as long as it's between, say, 9 a.m. and 5 p.m.

EXPERTS SAY

"I wasn't happy with the part about not eating breakfast," says Dr. David Heber of UCLA's Center for Human Nutrition.

WE TRIED IT!

PRO Our writer lost 2 lbs. in a week.

CON She fell asleep earlier—mostly so she could wake up and eat again!

MIRANDA KERR

Eat Right 4 YOUR TYPE

Meal plans customized for your blood type.

WHAT YOU EAT

Type O's eat a meat-heavy diet. Type A's eat mostly vegetarian.

EXPERTS SAY

"While none of the diet plans are unhealthy," says Alpert, "I have yet to see hard science to back up the claims."

WE TRIED IT!

PRO Our type A tester felt full and noticed clearer skin.

CON Grocery runs for a family with multiple blood types can get complicated.

JENNIFER LOPEZ

The FAST METABOLISM DIET

Rotate foods to increase weight loss.

WHAT YOU EAT

Nutritionist Haylie Pomroy (who works with Lopez) suggests two days of carbs and fruit, two days of proteins and veggies, then all four food types plus healthy fats for the rest of the week.

EXPERTS SAY

The variety "may keep people motivated," says Bauer.

WE TRIED IT!

PRO Our editor never felt deprived.

CON Requires serious planning.

  • Contributors:
  • with Alex Apatoff,
  • Pamela Edwards-Christiani,
  • Antoinette Y. Coulton,
  • Jackie Fields,
  • Liza Hamm,
  • Jessica Herndon,
  • Catherine Kast,
  • Andrea Lavinthal,
  • Elizabeth Leonard,
  • Raha Lewis,
  • Mary Margaret,
  • Nicole Mazur,
  • Zoe Ruderman,
  • Michelle Ward.