Seaweed contains a lot of fiber, which does not contain any calories.
The fiber in seaweed may slow stomach emptying, too. This helps you feel fuller for longer and can delay hunger pangs (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4771980/).
Seaweed is also considered to have anti-obesity effects. In particular, several animal studies suggest that a substance in seaweed called fucoxanthin may help reduce body fat. (http://www.eurekaselect.com/152644/article) (https://www.ncbi.nlm.nih.gov/pubmed/22054948), (https://www.ncbi.nlm.nih.gov/pubmed/15896707).
One animal study found that rats that consumed fucoxanthin lost weight, whereas rats that consumed the control diet did not.
The results showed that fucoxanthin increased the expression of a protein that metabolizes fat in rats (https://www.ncbi.nlm.nih.gov/pubmed/15896707).
Other animal studies found similar results. For example, fucoxanthin has been shown to significantly reduce blood sugar levels in rats, further aiding weight loss (https://www.ncbi.nlm.nih.gov/pubmed/18296336), (https://www.ncbi.nlm.nih.gov/pubmed/21475918).
The bacteria in our gut not only play an important role in digestion but research indicates that our microbiome could also play a major role in helping you maintain a healthy weight. Fucoidans in Brain Power™ can be food for the beneficial flora in the gut.