The present disclosure provides for the administration of β-NMN, which increases the secretion of adiponectin. The present disclosure also provides an adiponectin secretion enhancer comprising β-nicotinamide mononucleotide, a pharmaceutically acceptable salt thereof or a solvate thereof, and a dietary supplement containing the aforementioned secretion enhancer, which can be ingested in order to increase the secretion of adiponectin. Also disclosed are methods of treating insulin resistance-related diseases such as of metabolic syndrome, diabetes, hyperlipidemia, fatty liver disease, hypertension, obesity, and arteriosclerosis.