Studies have also shown that stress conditions can induce tolerance to high temperatures in S. cerevisiae; however, if the adapted yeast is grown under normal/optimal conditions, this thermotolerance can be lost [28] and [29]. In a recent study, thermotolerant S. cerevisiae strains isolated by physiological adaptation (adaptive evolution) to temperatures ≥ 40°C were found to have an altered sterol composition. The modification in the sterol composition of yeast strains was considered to maintain the fluidity of the cell membrane at high temperatures, resulting in increased thermotolerance [36]. Suutari et al. [28] found a negative correlation between fermentation ability and temperature increase. This correlation was attributed to changes in the membrane fluidity of S. cerevisiae at high temperatures. Therefore, experiments for isolating S. cerevisiae mutants that may be able to resist the changes in sterol composition against high-temperature stress are needed. These experiments can involve the addition of inhibitors of sterol metabolism or compounds that can alter the composition of the cytoplasmic membrane, ultimately stabilizing the membrane at high temperatures.