Not On A Diet in Portland, OR

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Telephone:	+1 310-699-6982
Website:	www.notonadiet.com
Address:	510 SW 3rd St, Portland, OR, 97204 Southwest Portland, Downtown
Nearby public transportation stops & stations:	100 ftSouthwest Washington & 3rd 460 ftMorrison/Southwest 3rd Avenue 570 ftSouthwest Washington & 5th
Categories:	Nutritionists

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By Appointment Only

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Local time (Portland)	5:01 PM Saturday, June 21, 2025

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Description

Specialties

Offering private nutrition counseling sessions to help you reach your nutrition and fitness goals. Specialties: Eating disorders (binge eating disorder, anorexia, bulimia, disordered eating), compulsive overeating, emotional eating. Sumner is a board certified Sports Specialty Dietitian and will work with athletes to help maximize nutrition for training, performance, and recovery. Many clients come to Sumner to help treat medical nutrition needs, such as diabetes or high cholesterol, along with eating behavior issues such as emotional eating or compulsive overeating.

History

Established in 2010.

Owner and registered dietitian (RD) Sumner Brooks, has extensive experience in the field of eating behavior and nutrition. Over the past 5 years she has worked with hundreds of individuals to educate, motivate and support them along a journey to finally feel good about how they eat. What makes Sumner unique is that you will not be told to follow a diet. You will learn how to change your eating thoughts and behavior, develop a healthy relationship with your body and with food, and eventually truly change your relationship with food for the better. Sumner is an active member of the Intuitive Eating community, Eating Disorder Coalition of the South Bay, Sports, Cardiovascular and Wellness nutrition practice group.

Meet the Business Owner

Sumner B.

Business Owner

Sumner Brooks started Not On A Diet with the mission to help people escape the unhealthy whirlwind of yo-yo dieting and create a lifestyle that supports a healthy body and mind.

As a Registered Dietitian (RD) since 2008, Sumner earned her master’s degree in Public Health from UCLA, and her BS in Nutrition and Food Science from San Diego State University. She obtained her specialty in Sports Nutrition in 2010 following extensive experience working with athletes at the collegiate, professional and college prep levels. Sumner has been supervised by the authors and dietitians who developed the Intuitive Eating model, on which she has based her practice philosophy.

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10 reviews of Not On A Diet

No registration required

Andrea T.

Place rating: 5
Austin, TX

Since attending sessions with Sumner Brooks, I have been a much happier person. She has taught me a lot about how to listen to my body’s hunger cues instead of starving myself on diets. I feel healthier, stronger, happier and more energetic now than ever before. I highly recommend her!

Sevan l.

Place rating: 5
San Francisco, CA

I rarely post reviews, but felt compelled to write a review after meeting Sumner. I have been looking diligently for a registered dietician and was lucky to find Sumner through Unilocal.She is highly professional, organized, asked a lot of targeted questions, and developed a comprehensive plan for «me». I have tried going to 2 other RDNs in the past and was sadly disappointed — apparently, 3^rd time is a charm. What I liked — she asked me about my goals, my fitness, things I liked to eat and customized a plan for me. I travel about 100% of the time, so she developed a plan that was specific to my lifestyle and level of fitness. My plan is easy to follow and she answered my questions without hesitation. I highly recommend Sumner if you are seeking someone who really knows what they are doing.

Janie H.

Place rating: 5
San Francisco, CA

Sumner does an amazing job in making her clients feel comfortable, regardless if they’re trying to lose weight or get a nutrition plan for training. Those were both of my goals at different periods and I felt like she was very knowledgable. Sumner provided options for a picky diet in trying to achieve the right nutrition. I would definitely recommend her services!

Tenna R.

Place rating: 5
Los Angeles, CA

With Sumner’s amazing expertise I was actually able to COMPLETE a new years resolution! I had promised myself in 2014 that I was going to get a handle on my relationship with food. I thought I had it all mastered by dieting (which I liked to call «eating healthy») and depriving myself of all foods that I loved. Within 20 minutes of my first session at Not On A Diet I realized the error of my ways. Sumner is a joy to work with… she is kind, gentle and everything she says instantly clicks and makes sense. Her process isn’t complicated, restrictive or difficult… in fact, it’s the exact opposite. I found the simple joy in food again (and love for myself)! The experience has been so positive my only regret is that I didn’t contact her much, MUCH sooner.

Holleh N.

Place rating: 5
Manhattan Beach, CA

Sumner is not only knowledgeable but also comforting. Her methods literally surprised me for the better! I walked in wanting her to tell me how to eat properly and I left with a sense of confidence in myself. Instead of looking to magazines, friends, billboards and family, I can now trust myself and my body to make proper decisions. She literally gave me my life back! Our society is driven to fit this ideal mold and Sumner knows exactly how to change your way of thinking. Trust me when I say she is awesome! I have no regrets in seeing her and would gladly do it all over again. Deep down you know when you need some help so don’t ignore that voice!

Annie A.

Place rating: 5
Glendale, CA

«I want a six pack,» I said. «I want to lose weight fast,» I said. «I want to create a strict diet,» I said. Sumner just listened and said, «Ok.» But what really happened next? She taught me what I really needed to learn: how to listen to my body and respond accordingly. First things were first and priorities were re-established. I had to learn that our relationship with food can’t sit on extremes. It’s not about deprivation and it’s not about excess. It’s about balance. Sounds much easier than it really is, but with some kind words and advice, Sumner guided me in the right direction. She shed light on things I didn’t recognize and things that were, admittedly at times, a little uncomfortable to discuss. But it was important and I’m glad we did. Sumner’s directness was refreshing but not offensive. She forced me to focus, to think, and to evaluate my own well-being in a honest manner. And frankly, her lessons work. I gained more than I ever would with a six pack because I gained the knowledge to live my life without worrying about the next bite I stick in my mouth. And that, my friends, is priceless… especially since she also showed me how I can still lose weight without the harshness of a diet. All-in-all, Sumner is pure awesomeness. Thanks Sumner.

Ron S.

Place rating: 5
Manhattan Beach, CA

Sumner has been such a great find. She is very instructive, my overall health has improved considerably. Her patience and warmth are part of the good experience here. In particular, I had issues with cholesterol, triglycerides and weight. What I have learned from her is so helpful that I have sought to make others aware of her. It has not been difficult, I am not deprived, I will not regain; what I have gained is the knowledge of what makes sense, how to do it, how it impacts me, and in the space of maybe 5 to 6 meetings/consultations, I have major improvement. My concern if I write a glowing review is people think somehow I am doing this as a favor to her. All I can say is that would be unfortunate for others to believe. She is awesome.

N m.

Place rating: 5
Hawthorne, CA

As an athlete competing at an International level it was imperative to have «gas in the tank» for my 6 – 10 hours of intense MMA and Jiu-Jitsu training. I was always cutting weight eating high protein and basically starving myself and still not losing anything but a lot of water. I had won the Las Vegas Abu-Dhabi trials by de-hydrating and needed to find a way to keep my momentum for the San diego Abu-Dhabi Trials. As a trainer i had a notion of what i had to do, but going to Sumner changed my LIFE and allowed me to eat not only more, but well balanced and a lot more carbs for gas=)I went on to win San Diego Abu-Dhabi trials and got the trifecta and became a World Champion by winning the Pan-Ams.I cant not recommend Sumner highly enough, she knows Sports Nutrition and if your serious, she is the ONE!!! Thanks so much Sumner

Anne k.

Place rating: 5
Redondo Beach, CA

As someone who has tried every diet out there, I can honestly say that my FIRST hour spent with Sumner was more beneficial than all of my prior dieting attempts combined. I had no idea what to expect, but I went in to my first appointment with an open mind and a willingness to learn.
What I have learned from Sumner is that many answers I seek must come from within. Sumner is all about meeting where you are on your path to good health and offering REALISTIC tools for success on your journey. I never thought I’d be able to understand so much about nutrition by simply examining my relationship with food.
Sumner is supportive, knowledgeable, and thoughtful in her approach to serving not only my needs, but also the needs each individual client. I cannot say enough good things about Sumner, but I thank her for encouraging me to see the bigger picture of healthy living vs. the day to day minutia of dieting. It’s made a world of difference!

Abby F.

Place rating: 5
Kendall Square/MIT, Boston, MA

I feel SO incredibly fortunate to have found Sumner, she’s wonderful! Diets had stopped working for me, I knew I needed a different option but was really nervous about what a nutrionist would tell me or «make» me do. But now, I can’t believe I waited this long.
Sumner is incredibly encouraging and uplifting, and she’s really worked WITH me. She listens and understands where I’m at, what I’m comfortable doing and where I want help and then she helps me in those areas. She gives gentle guidance and offers me new ways of thinking about what I’m eating and how I’m moving my body.
And — this is the most amazing part to me – she respects that _I_know best about my body and my hunger & fullness, and she works with me to help me better tune into that. She’s really been like a personal coach, helping me find the ways that are most natural to me to lose the weight and build a healthier life style. She’s made me feel positive about food for the first time in I don’t even remember. Thank you, Sumner!

Not On A Diet

Portland, United States