Burning more calories than you eat in a day is referred to as a “calorie deficit” and is the basis of many weight-loss equations. The idea is daily calories in minus daily calories out = caloric deficit. The first thing you need to understand is that one pound of fat is made of about 3,500 of extra calories. To lose one pound of fat, you need to create a caloric deficit of 3,500 calories. For example if you wanted to lose one pound a week divide 3,500 calories by seven to get 500; that means negative 500 calories a day overall. FIND OUT IF WEIGHT-LOSS SURGERY IS RIGHT FOR YOU? There are only 3 ways you can create a deficit of calories each day:
The key to any successful weight loss is consistency. Over time your calorie deficit will ‘add up.’ and you will lose the extra weight. But remember to be super accurate with your caloric intake and exercise because after all it is a math equation.” It’s also important to note that although this seems like simple math, our bodies are actually very complicated. We also have emotions, hormones, stress and more that can factor into the equation so you might not always see the results you expect based on equations alone. If efforts to lose weight with diet and exercise have been unsuccessful and your body mass index (BMI) is 40 or higher (or 35 or more and you have a serious weight-related health problem, such as type 2 diabetes, high blood pressure or severe sleep apnea), you may qualify for weight-loss surgery. To learn more, visit our weight-loss surgery program page or call us at (310) 836-7000. To find a bariatric surgeon, click here.
November 2014 Issue Farewell to the 3,500-Calorie Rule Researchers have developed new mathematical formulas RDs can use to more accurately predict the rate of weight loss in patients. If you've counseled clients and patients for weight loss, you know that even the most diligent of dieters eventually will reach a weight-loss steady state, a plateau, a stumbling block that can be frustrating for them and dietitians alike. And, unfortunately, a large percentage of those who succeed at losing weight will gain it back over time. We all know the weight-loss rules: eat more calories than you burn and you'll gain weight; eat fewer calories than you burn and you'll lose weight. However, researchers say it's not that simple. In an effort to better understand the weight-loss process, researchers have devised an ingenious way to more accurately predict the trajectory of weight loss for individuals via a mathematical formula. The hope is that using it will result in more realistic expectations for weight loss with fewer disappointments along the way, and help explain when and why weight-loss plateaus occur, even among seemingly dedicated dieters. Also in development is a personalized dynamic feedback control mechanism that clients can wear to monitor their progress and determine when it's time for reassessment with a dietitian. It's also a method for RDs to predict in advance who's most likely to succeed at losing those excess pounds longterm. Conventional Weight-Loss Wisdom It's been estimated that the 3,500-calorie rule is cited in more than 35,000 educational weight-loss sites.1 In September, the Journal of the American Medical Association published a patient handout titled Healthy Weight Loss, in which the first sentence states, "A total of 3,500 calories equals 1 pound of body fat. This means if you decrease (or increase) your intake by 500 calories daily, you will lose (or gain) 1 pound per week."2 Undoubtedly, the 3,500-calorie dogma still is being taught even though it's been shown that it simply doesn't work this way. So where did the 3,500-calorie weight-loss wisdom come from? It originated from researcher Max Wishnofsky, MD, in 1958, who calculated that 1 lb of fat stores approximately 3,500 kcal of energy.3 It was appealingly simple, and it stuck. "I think this happens often when there is a simple rule of thumb," says Diana Thomas, PhD, director of the Center for Quantitative Obesity Research at Montclair State University, and one of the researchers involved in developing the new approaches. "It's easy to propagate, and there's resistance to adopting something that's more complex." The 3,500-calories-per-pound rule seemed to make sense at the time, but much has occurred in the area of human nutrition in the last 55 years, including the sharing of expertise among fields. The breakthrough in the understanding of how and why weight loss occurs and predicting the rate at which it does, is the result of experts in nutrition and mathematics putting their collective heads together, coming up with complex formulas and then simplifying them. Elusive Weight-Loss Success The new complex weight-loss formulas factor in the drop in metabolic rate that occurs over time as body mass decreases. After applying the formulas to individuals, a main conclusion Thomas and other researchers have drawn isn't a popular one—that people generally plateau early in the weight-loss process, not because of a metabolic slowdown, although that does occur, but because they don't adhere to calorie-reduced diet plans consistently long term.4,6 "If a plateau is reached within six months, then in all likelihood, the person is no longer strictly adhering to the diet," says Carson C. Chow, PhD, a senior investigator in the mathematical biology section of the National Institutes of Health (NIH). Six to nine months is the typical timeline for dieters to reach the dreaded plateau, but "given that body weight changes so slowly, it could be stretched out to a year," Chow says. The new formulas allow clinicians to see what realistically can be expected based on the individual's weight, age, gender, and physical activity, and close monitoring allows for adjustments in the predictive formula.7 Where exactly does exercise fit in? The effect of physical activity on the rate of weight loss isn't clear. However, research suggests that the small amount of weight loss sometimes seen in exercise intervention studies isn't due to exercise's lack of effect on weight loss, but it's a result of not getting enough exercise prescribed,6 and that's compounded by an increase in calorie intake—in other words, not sticking to the prescribed reduced-calorie diet long term.1 The ratio of macronutrients in the diet, specifically the ratio of protein to carbohydrates and fat, has been endorsed as a way to promote weight loss. However, little effect has been demonstrated in the short term. Yet, according to Kevin Hall, PhD, a senior investigator in the mathematical biology section of the NIH, not enough is known about the long-term effects of varying macronutrient diet composition.4 As a result, the ratio of macronutrients in the diet isn't included in the new weight-loss prediction formulas. New Weight-Loss Math Hall and Thomas agree that while there are several minor differences in their models, the predictions are similar. The NIH calculator allows for more detailed input about physical activity, and the Pennington model enables users to compare the newly calculated downward weight-loss trajectory, based on your input, with that of the 3,500-calorie-per-pound rule. The new mathematical approaches have been validated repeatedly, researchers say. In fact, the 3,500-calorie guideline was refuted in a consensus statement issued jointly by the American Society for Nutrition and the International Life Sciences Institute in 2012,8 although the math approaches haven't been widely adopted for clinical weight management or used to inform policy discussions.4 Still, Hall has high hopes for the new weight-loss math. "I think our methods could be used to remotely monitor patients and detect early signs of adherence loss that would trigger a counseling session or a reevaluation of weight goals and the type of intervention," says Hall, who has invented the personalized dynamic feedback control device, for which the NIH has filed a patent.9 No word on when or if it will be available, but it looks like it may be the way of the future. If clients and patients prefer something less complex, Chow has broken it down to a simple rule of thumb. "While the 3,500-calorie rule has been challenged in the past, we were the first to replace it with an equally simple, but more accurate rule, and that is that 'every 10 calories per day decrease in calorie intake leads to an eventual one-pound loss,' but it can take three years to get there," Chow says. In other words, weight loss isn't a linear event over time, as the 3,500-calorie rule suggests. All of this new information shows that weight loss may be slow, even slower than we thought. That makes patience a major factor in weight-loss success. And because compliance wanes over time, consistency is the other major part of the equation that adds up to successful weight loss. "Successful weight management is a long-term endeavor that requires diligence each and every day," says Corby Martin, PhD, director of the Ingestive Behavior Laboratory at Pennington Biomedical Research Center. "It's critical that patients and dietitians continuously monitor progress and adjust their treatment strategy accordingly. If a patient's current treatment regimen isn't working, it's imperative to detect this as early as possible and employ more intensive strategies." Both Chow and Hall believe that taking active control of food consumption may be required to limit the long-term increase in energy intake that typically occurs, especially in the face of the dramatic rise in availability and marketing of highly palatable, convenient, inexpensive, and energy-dense foods.7 And perhaps most intriguing is the new research expected to be published this year by Thomas and colleagues. "We have a paper under review about a way to make it easy for dietitians to identify, from short-term data, who's likely to be successful at losing weight over the long term." Counseling Recommendations While the new online tools likely will predict much slower progress than anyone would like, dietitians can use them to help clients and patients set more realistic goals and let them know that progress probably will be slow and unsteady. Furthermore, if they've been reading about weight loss online or in diet books, inform them that the thinking has changed dramatically and the 3,500 calories-per-pound rule no longer applies. — Densie Webb, PhD, RD, is a freelance writer, editor, and industry consultant based in Austin, Texas. References 2. Guth E. JAMA patient page: healthy weight loss. JAMA. 2014;312(9):974. 3. Wishnofsky M. Caloric equivalents of gained or lost weight. Am J Clin Nutr. 1958;6(5):542-546. 4. Hall KD, Sacks G, Chandramohan D, et al. Quantification of the effect of energy imbalance on bodyweight. Lancet. 2011;378(9793):826-837. 5. Hall KD, Chow CC. Why is the 3500 kcal per pound weight loss rule wrong? Int J Obes (Lond). 2013;37(12):1614. 6. Thomas DM, Bouchard C, Church T, et al. Why do individuals not lose more weight from an exercise intervention at a defined dose? An energy balance analysis. Obes Rev. 2012;13(10):835-847. 7. Chow CC, Hall KD. Short and long-term energy intake patterns and their implications for human body weight regulation. Physiol Behav. 2014;134:60-65. 8. Hall KD, Heymsfield SB, Kemnitz JW, Klein S, Schoeller DA, Speakman JR. Energy balance and its components: implications for body weight regulation. Am J Clin Nutr. 2012;95(4):989-994. 9. Personalized dynamic feedback control of body weight: United States patent application US 20130198214 A1. Google Patents website. http://www.google.com/patents/US20130198214. Accessed September 4, 2014. |