To be specific, an “umbrella review” (basically, a meta-analysis of several meta-analyses, which is the absolute peak of reliability of what our current scientific processes can provide) was performed and found that “…There was a negative correlation between the intake of spicy food and capsicum and blood pressure, energy expenditure, respiratory quotient, obesity, all‐cause mortality, cardiovascular mortality, or cerebrovascular accident deaths.” https://en.wikipedia.org/wiki/Umbrella_review