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SULT2A8 is a male-predominant and liver-specific mouse cytosolic sulfotransferase (SULT) that sulfonates 7α-hydroxyl (7α-OH) bile acids in vitro. Sulfonation regulates bile acid homeostasis, which in turn regulates cholesterol and energy metabolism. Using the Sult2a8-heterozygous (HT) mouse model created earlier in our laboratory, we aimed to investigate the physiological role of SULT2A8 in sulfonating 7α-OH bile acids and its impact on energy metabolism in vivo under both fed and energy-deprivation conditions. Disruption of one allele of the Sult2a8 gene in male HT mice resulted in losing ~ 50% of the 7α-OH sulfonating activity compared to wild-type (WT) control, but no significant change in female HT mice. Under the fed condition comparing the levels of hepatic and biliary bile acids as well as plasma/serum energy metabolites, HT mice displayed a profile similar to that of WT mice, suggesting that the Sult2a8-haplodeficient mice conducted normal energy metabolism. However, after 48-h fasting, a significant decrease in plasma cholesterol level was found in male HT mice but without any significant reduction in female HT mice. Of interest, in male Sult2a8-haplodeficient mice, an increase of the hepatic taurine-conjugated cholic acid level was noted but no noticeable change in other tested bile acids after fasting. Taken together, SULT2A8 is a male-specific and key hepatic SULT in metabolizing 7α-OH primary bile acids. During energy deprivation, SULT2A8 is required to maintain the bile acid and cholesterol metabolism, suggesting SULT is a potential therapeutic target for controlling metabolic diseases.