One of America's top celebrity trainers gives her number one tip for losing weight

5 Scientific Tips to Lose Weight

Autumn Calabrese is a star trainer.

She's become synonymous with Beach Body's 21 Day Fix nutrition and exercise plan, which has taken the Internet by storm. Many people are envious of her chiseled abs.

She has a wealth of knowledge when it comes to what people need to get in shape, but her number one diet and wellness tip is surprising -- it doesn't involve freak cleanses, nixing carbs, or taking the hair of a small child to create a magic witch's brew.

In fact, you probably have the ingredient readily on tap...pun intended.

"Drink water," she said in a phone interview with Business Insider. "Yeah, portion control is really important, too [but] it's amazing how many Americans are actually dehydrated and that leads to so many problems."

And many times you reach for that bag of chips, you might just be thirsty.

"Our bodies can't really tell the difference between hunger and thirst," she said, "so a lot of times people are dehydrated and they think they're hungry so they go eat when really they just need ... a glass of water."

"That's what our bodies are made of ... it's what flushes our system ... keeps us going," she said. "Being dehydrated is a miserable feeling; I've done it for competitions ... so my biggest tip is actually drink your water."

Can't stomach the stuff? Good news -- you don't need to chug eight full glasses each day, and there are water bottles that can make imbibing water a much more pleasant experience.

Photos of celebrities and their workout pictures:

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One of America's top celebrity trainers gives her number one tip for losing weight
Be a #supermomma multitasker by mixing playtime into your #workout! Today on MollySims .com, I’m showing you 5 moves to make mommy & me exercise fun! 💪🏻💦#mommyandme #mollysims @whiteandwarren @underarmour {link in profile}
That post workout face where you give as little effort as possible due to fatigue. *In the background sits the worlds most powerful subwoofer. Why? 'Cause at times I'm certifiably crazy, but then again aren't we all. #GoodMorningFromIronParadise #WhereCrazyMeetsGreatness #EveryDayOfTheWeek 👊🏾🔥
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Spent the morning #takingCareOfUs.
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MONDAY morning madness.
Miss @tracydawnhall and I - AM 🚴🏾💦💨 w @SpinGalNichelle @cyclehousela
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Sometimes you have to work your baby into your workout...but that's ok because the world is your playground! #MonkeyBars #WorkoutAnywhere @caliabycarrie #StayThePath
Me acting like i didnt see the camera yesterday during my workout...look good ,feel good now it's time to play good. let's get back on track 2nite #heatnation
Working out on Monday? It's a stretch 😉
Getting my "Flagpole" game together....I'm still a work in progress but I like my progression!!!! #HustleHart #Motivation #healthiswealth #CoreStrength #SundayFunday
Still standing!!!! A big thanks to @underarmour for the sick uniforms for me and my teammates!!!!
Thanks for kicking my butt today Justin @modelfitbyjustingelband
Its not easy being green... or drinking a gallon of water a day... or doing an impromptu photoshoot in your new workout clothes 💃💪👀❤💚💛💜 Thanks @sformes #3Six5 @3six5sport #BeingMar yJane #AMeyersChristmas #43
It's Workout Wednesday!! #workoutwednesday LOVE this move @pg13fit butt, hamstrings, quad & triceps! 10 x each leg...Kick at the end optional 😜 1-2-3...GO #healthyliving #fitspo #fitfam #workout @pinkboxstudio thx for the tank! #badass

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