Are 800 calorie diets safe?

By: Scottsdale Weight Loss Center
Published: January 24, 2019
Hand adjusting daily calorie intake dial.

It seems nearly everything we learned about obesity in training was wrong if we were taught anything at all. Medical schools and residencies teach the essentials of nutrition for the critically ill patients. When someone is hospitalized, they need adequate nutrition for healing: protein, essential fatty acids, electrolytes, vitamins, minerals, trace elements and water for recovery and healing. Then when we began outpatient medicine, we were flooded with patients with obesity and its consequences of diabetes, hypertension, hyperlipidemia, sleep apnea, fatty liver disease, cancers, and arthritis. Many of those conditions resolve with weight loss. Unfortunately, we were ill prepared to manage the underlying disease of obesity. If we had the knowledge, we never had the time to dedicate during a busy office visit to implement a successful weight loss plan. That is why the specialty of obesity medicine exists.

The NEJM article Myths, Presumptions, and Facts about Obesity dispels many of the beliefs we had about obesity and how to manage it. One of the common myths is that fast weight loss is unsafe and ineffective and that an 800 calorie diet cannot provide sufficient nutrition. Contrary to this myth, the article states, “within weight-loss trials, more rapid and greater initial weight loss has been associated with lower body weight at the end of long-term follow-up.” Furthermore, “a recommendation to lose weight more slowly might interfere with the ultimate success of weight-loss efforts.” In other words, the greatest weight loss at one year occurs in those that lost the weigh the fastest in the first six months of treatment.

An 800 calorie diet can be safe if it provides complete nutrition. It can also be unsafe when it lacks any essential nutrient. One main advantage of medical meal replacements is they provide everything needed for health while providing much lower calories. It is logistically impossible to provide complete nutrition on a whole food diet, and therefore, the weight loss will be much slower. In our experience, the ketones produced from more rapid weight loss also makes weight loss easier, probably due to lower levels of ghrelin, an appetite-stimulating gut hormone. Furthermore, the more rapid weight change results in a rapid drop in blood pressure and blood sugars, with the resulting need for lower antihypertensive and diabetes medications. So faster weight loss is easier for the patient results in more rapid improvement in health, and results in more sustained weight loss.

NEJM Reference

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I landed at Scottsdale Weight Loss 13 years ago and lost 50 pounds….regained 10 and then lost them again, plus another 20. It is a great program, and all the professionals are amazing and caring.
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SWL has been a God send to me! Dr. Guzman & staff especially Lilia & Bianca! They’re so supportive & professional I have lost approx 50 pounds over the year at my own pace.
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Great place 30 lbs.and counting thank you And now it is over 40 lbs. and counting thank you great job
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I cannot say enough wonderful things about Dr Robert Ziltzer! He helped me reach my ideal weight and more importantly maintain it for over 2 years. He has also helped me keep my blood pressure exactly where my internist wanted it. Dr Ziltzer is not only exceptional in weight management but also a truly gifted internet’s. His knowledge, kindness, and dedication are remarkable. I am deeply grateful for his care and recommend him whole heartedly!
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The staff at the Phoenix office are great! My experience with Dr deGuzman has been wonderful. Miriam has always been very helpful and makes the office visits pleasant and personal. The medical assistants have always been professional and great to help meet my goals.
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I really felt comfortable with Kristen at my initial appointment. Everyone at the center was caring and friendly, from Bianca, at the front desk, to Lily, who is the MA. Kristen listened to my frustrations and prior disappointments about what has not worked, and is confident that she can help me achieve my goals of weight loss. I am looking forward and excited to see the success I will attain.
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I'd lost 20 pounds on my own and struggled to keep it off. I decided GLP-1 meds were the next step in losing more and keeping it off. I wanted a medical doctor supervised program and chose SWLC. I am so very glad I did! The team in Glendale is so supportive and kind; and when I feel discouraged, they pick me up with positive energy and input. They really do a great job with encouragement all the time. 6 weeks in I've lost 17 pounds, and am approaching weight loss with a very new perspective. Also knowing that when I reach my target goal, they'll be there through maintenance and beyond is encouraging as well. Good to not feel alone on this journey.
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