Dietary and nutritional supplements containing beta-hydroxybutyrate esters, acetoacetate, acetoacetate esters, and precursors thereof such as 1,3-butanediol, medium chain triglycerides, medium chain fatty acids, and medium chain fatty acid esters in combination with a hemp derived cannabinoid, namely, cannabidiol and tetrahydrocannabinol; the foregoing containing not more than trace amounts of naturally occurring cannabidiol and a delta-9 THC concentration of not more than 0.3 percent on a dr...