Recent studies show that eating three larger meals a day is better for weight loss, but only because the practice ostensibly staves off hunger better. In the end if you eat the same food (caloric count) throughout the day, it doesn't matter how many meals you have.
http://www.stuff.co.nz/life-style/459643
http://www.ncbi.nlm.nih.gov/pubmed/9155494
http://www.ncbi.nlm.nih.gov/pubmed/3592618
So yeah, consuming smaller, more frequent meals as a means to weight loss or "boosting your metabolism" is basically broscience.