Effects of spirulina consumption on body weight, blood pressure, and endothelial function in overweight hypertensive Caucasians: a double-blind, placebo-controlled, randomized trial. which was published in 2016.
The study concluded that not only does regular spirulina implementation improves BMI and weight, but also improvements in blood pressure and endothelial function (thin membranes that lines the inside of the heart and blood vessels).
In this randomized double-blind placebo-controlled trial, 40 patients with hypertension but lacking evidence of cardiovascular disease were enrolled to receive daily either 2.0 g Hawaiian spirulina or placebo for three months.
All patients were advised to continue their habitual diet and exercise patterns throughout the study
"In this study, the body mass reduction effect of spirulina was observed in overweight patients. There are various human studies regarding the effect of spirulina on anthropometric parameters in different groups of patients. In patients with ischemic heart disease, a significant loss in body weight was observed after intervention with spirulina."
After three months, there was no change in body mass index (BMI) or weight in either the spirulina or the placebo group. However, a significant reduction in SBP and SI was observed. The patients in the spirulina group showed significant reductions in BMI.