Research from JAMA Internal Medicine — Vegetarian Diets and Blood Pressure — A Meta-analysis

Although a recent meta-analysis of randomized controlled trials showed that adoption of a vegetarian diet reduces plasma lipids, the association between vegetarian diets and long-term effects on plasma lipids has not been subjected to meta-analysis. The aim was to conduct a systematic review and meta-analysis of observational studies and clinical trials that have examined associations between plant-based diets and plasma lipids. MEDLINE, Web of Science, and the Cochrane Central Register of Controlled Trials were searched for articles published in English until June 2015. The literature was searched for controlled trials and observational studies that investigated the effects of at least 4 weeks of a vegetarian diet on plasma lipids. Two reviewers independently extracted the study methodology and sample size, the baseline characteristics of the study population, and the concentrations and variance measures of plasma lipids. Mean differences in concentrations of plasma lipids between vegetarian and comparison diet groups were calculated. Data were pooled using a random-effects model. Of the 8385 studies identified, 30 observational studies and 19 clinical trials met the inclusion criteria (N = 1484; mean age, 48.6 years). Consumption of vegetarian diets was associated with lower mean concentrations of total cholesterol (−29.2 and −12.5 mg/dL, P < 0.001), low-density lipoprotein cholesterol (−22.9 and −12.2 mg/dL, P < 0.001), and high-density lipoprotein cholesterol (−3.6 and −3.4 mg/dL, P < 0.001), compared with consumption of omnivorous diets in observational studies and clinical trials, respectively. Triglyceride differences were −6.5 (P = 0.092) in observational studies and 5.8 mg/dL (P = 0.090) in intervention trials. Plant-based diets are associated with decreased total cholesterol, low-density lipoprotein cholesterol, and high-density lipoprotein cholesterol, but not with decreased triglycerides. PROSPERO number CRD42015023783. Available at: https://www.crd.york.ac.uk/PROSPERO/display_record.asp?ID=CRD42015023783.

Vegetarian diets and glycemic control in diabetes: a systematic review and meta-analysis

Objective: Many claims have been made regarding the therapeutic efficacy of acupuncture. However, most controlled clinical studies have been limited to treatment of pain-related disorders and do not provide objective, quantifiable data for analysis. Traditional acupuncture has been applied to chronic obstructive pulmonary disease (COPD). However, only a few studies have been performed to determine the efficacy of this treatment. This study was conducted to determine whether a combination of traditional acupuncture treatment and conservative treatment for COPD improves dyspnea on exercise. Methods: This was a prospective trial with matched-pair parallel groups of patients from the departments of respiratory internal medicine of Gifu University of Medicine, Meiji University of Oriental Medicine, and Gifu Red Cross Hospital, Japan. Thirty patients were divided into the acupuncture group (n = 15) and the control group (n = 15). The control group received conservative treatment with medication only. The acupuncture group received acupuncture treatments once a week for 10 weeks, in addition to conservative treatment with medication. The main outcome measure was the Modified Borg dyspnea scale after the 6-minute walk test. Results: The acupuncture group had significantly better results on the Borg scale than the control group after 10 weeks (2.2 ± 2.7 versus 6.4 ± 3.4, p = 0.0001, 95% confidence interval, −5.10 to −2.35, paired t-test). The 6-minute walk distance and oxygen saturation at the minimum rate improved significantly in the acupuncture group compared with the control group. Conclusions: This study demonstrated that acupuncture contributed to the reduction of COPD-related dyspnea on exercise in 15 matched-pair parallel subjects.