Study under review: Effect of Weight Loss via Severe vs Moderate Energy Restriction on Lean Mass and Body Composition Among Postmenopausal Women With Obesity: The TEMPO Diet Randomized Clinical Trial
Obesity has been described as a public health crisis, with its prevalence increasing in many parts of the world. Since obesity increases the risk of numerous health conditions, it’s no surprise that it has been associated with a lower quality of life and a reduced life expectancy. Importantly, sustained modest weight loss of 5-10% can reduce the incidence and progression of a number of health conditions associated with obesity. As such, several dietary weight loss strategies have been developed and tested over the past few decades. What all of them have in common is that they place the participant in a negative energy balance in order to achieve weight loss.
While the goal of weight loss dietary interventions is to reduce bodyweight through energy restriction, experts have yet to reach a consensus regarding the degree of energy restriction and rate of weight loss that will result in the best possible long-term outcomes. On the one hand, diets that severely restrict energy intake have been found to result in significantly greater short- and long-term weight loss compared to diets that moderately restrict energy intake. On the other hand, some research has reported that severely energy-restricted diets may result in greater losses in lean body mass and larger risk for weight regain compared to moderately energy-restricted diets, while other research has detected no effect of the size of the energy deficit on changes in lean body mass and risk for weight regain.
Although studies like the ones mentioned above have tried to shed light on how the degree of energy restriction and rate of weight loss may affect body composition, the available research to date suffers from a number of limitations. For example, the aforementioned studies were not randomized clinical trials, were of short duration, or were not specifically designed to measure changes in body composition as the primary outcome. The study under review aimed to address these limitations by directly comparing the long term (longer than six months) effects of severe vs. moderate energy restriction on body composition in postmenopausal women with obesity.
Current dietary guidelines emphasize the importance of weight loss in people with overweight and obesity for improving health outcomes. However, the degree of energy restriction and rate of weight loss that will result in the best possible long-term body composition outcomes is still being debated. The study under review aimed to investigate the long term (longer than six months) effects of severe vs. moderate energy restriction on body composition in adults with obesity.
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Other Articles in Issue #61 (November 2019)
NERD Mini: Can exercising help alleviate primary dysmenorrhea?
We summarize the main take-aways from a recent Cochrane review exploring exercise's effects on primary dysmenorrhea.
Cutting through liver fat with citrus
Hesperidin, a compound found in the peels of citrus fruits, has shown promising results in rats for improving fatty liver. This trial put hesperidin to the test in people with nonalcoholic fatty liver disease.
Investigating the effects of eating every other day on body composition and aging-related factors
The effects of alternate-day fasting haven't been well-explored in metabolically healthy people without obesity. This study aimed to help fill that gap.
Investigating dairy to improve insulin resistance
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Casting a wider net for marine oil’s cardiovascular benefits
We previously covered a major meta-analysis which found that marine-derived omega-3 supplementation didn't have clear cardiovascular benefits. However, three large trials have been released since then. Do they make a difference?
Pro-bono: protein for bone retention
When people say they want to lose weight, they usually mean losing the weight from fat. However, weight loss can also lead to bone loss. This study explored whether high-protein diets can help retain bone.
NERD Mini: Nutrient supplements for mental health disorders
We summarize key takeaways from a recent umbrella review that explored how useful nutrient supplementation is for a variety of mental health issues.