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  4. Effects of a low-­carbohydrate/high-­protein diet on metabolic health in individuals with chronic spinal cord injury: An exploratory analysis of results from a randomized controlled trial

Effects of a low-­carbohydrate/high-­protein diet on metabolic health in individuals with chronic spinal cord injury: An exploratory analysis of results from a randomized controlled trial

Physiological Reports, 2022 · DOI: 10.14814/phy2.15501 · Published: November 1, 2022

Spinal Cord InjuryEndocrinologyNutrition & Dietetics

Simple Explanation

This study investigated the effects of a low-carbohydrate/high-protein (LC/HP) diet on metabolic health in individuals with chronic spinal cord injury (SCI). The study aimed to determine if this dietary approach could improve body composition, glucose tolerance, insulin resistance, blood lipid profile, and chronic inflammation in this population. The researchers randomly assigned participants with SCI to either an 8-week LC/HP diet or a control group with their habitual diet. They carefully monitored various health indicators before and after the intervention to assess the diet's impact. The study found that the LC/HP diet led to improvements in body composition (reduced body fat and visceral fat) and blood lipid profiles (reduced total and LDL-cholesterol) compared to the control group. However, the diet's impact on glucose metabolism and inflammation was less conclusive and requires further investigation.

Study Duration
8 Weeks
Participants
25 adults with SCI (≥3 years post-­injury, C4-­L2, AIS A-­D) and insulin resistance or pre-­diabetes
Evidence Level
Level 1, Randomized controlled trial

Key Findings

  • 1
    The LC/HP diet led to a significant reduction in total body fat mass and visceral fat mass compared to the control group.
  • 2
    Participants on the LC/HP diet experienced a notable decrease in total cholesterol and LDL-cholesterol levels compared to the control group.
  • 3
    While not statistically significant, there was a trend suggesting that the LC/HP diet may improve glucose control, as indicated by a decrease in glucose concentration at 120 minutes during the oral glucose tolerance test.

Research Summary

This study explored the impact of an 8-week low-carbohydrate/high-protein (LC/HP) diet on metabolic health in individuals with chronic spinal cord injury (SCI). Participants were randomized to either the LC/HP diet or a control group with their regular diet. The study found that the LC/HP diet resulted in reduced total body fat mass, visceral fat mass, total cholesterol, and LDL-cholesterol compared to the control group. These results suggest potential benefits for body composition and lipid profiles in individuals with SCI. The effects of the LC/HP diet on glucose metabolism and inflammation were inconclusive, warranting further investigation. However, the findings highlight the importance of dietary modifications for improving metabolic health in the SCI population.

Practical Implications

Dietary Intervention

A low-carbohydrate/high-protein diet may be a beneficial dietary intervention for improving body composition and blood lipid profiles in individuals with chronic SCI.

Metabolic Health Management

Dietary modifications, such as adopting an LC/HP diet, should be considered as part of a comprehensive strategy for managing metabolic health and reducing cardiovascular risk in the SCI population.

Further Research

Further research is needed to fully understand the impact of LC/HP diets on glucose metabolism and inflammation in individuals with SCI, including long-term safety and efficacy trials.

Study Limitations

  • 1
    The control group consumed their usual diet, which had a normal protein content (~16%) as well as low diet quality.
  • 2
    Due to the small sample size, it was not feasible to evaluate whether the impact of the diet differed for participants in different age groups, sexes, levels of injury, completeness of injury, or duration of the injury.
  • 3
    The study result may not be generalizable to all individuals with SCI.

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