Study under review: Effects of Dietary Protein Quantity on Bone Quantity following Weight Loss: A Systematic Review and Meta-analysis.
Weight loss diets are widely considered to be a healthy endeavor but can come at the cost of lean tissue loss. The most well-known source for loss of lean tissue is muscle mass, but dieting off those excess pounds can also cause a loss of bone mass. One of the major reasons this occurs is through physics: increased mechanical loading of bone is a strong stimulus for bone formation. By reducing body mass, weight loss reduces the amount of force on the skeleton, resulting in bone loss over time.
Since high protein diets have been shown to help preserve muscle mass during calorie restriction, it is possible that they could also preserve bone, especially since a lot of protein, in the form of collagen, goes into making and maintaining bone. Studies on the effects of dietary protein intake on bone mass during weight loss diets report mixed results, however, with some studies showing attenuation of bone loss while others have shown neutral effects or even increased bone loss.
Can increased protein intake help to prevent bone loss during weight loss diets? The study under review aimed to answer this question through a systematic review and meta-analysis of randomized controlled trials to assess the effect of dietary protein intake on changes in bone mass during weight loss diets.
Although weight loss can be healthy for people with obesity, weight loss diets can also cause loss of bone mass. The study under review examined whether high protein diets can preserve bone mass during weight loss through a systematic review and meta-analysis.
Other Articles in Issue #61 (November 2019)
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.
Rate of weight loss and body composition: does “slow and steady” win the race?
More severe energy restriction usually leads to higher amounts of weight loss, but it could also lead to a higher proportion of muscle or bone loss. This study explored the effects of the rate of weight loss in postmenopausal women.
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
This meta-analysis suggests that dairy intake can help curb insulin resistance and shrink waistlines a little. But "dairy" is a pretty wide-ranging category...
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?
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.