Intake of 75 mmol/L NaCl solution, water, and total fluid, and NaCl preference in B6 and 129 mice fed one of three standard cereal-based diets (Teklad 8604, Zeigler NIH-07, and Purina 5001), a “breeder” diet (Purina 5015), or two purified diets (AIN-76A and AIN-93G). Values are means ± SEM, n = 15 or 16 per strain for each diet. The following differences were significant (P < 0.01; see also Table 4): NaCl intake: B6 > 129; Water intake: B6 < 129; Purina 5015 < standard cereal-based diets or purified diets; B6 fed standard cereal-based diets > B6 fed Purina 5015 or B6 fed purified diets; Total intake: B6 > 129; Purina 5015 < standard cereal-based diets or purified diets; NaCl preference: B6 > 129; Purina 5015 > standard cereal-based diets or purified diets; B6 fed Teklad 8604 or B6 fed Zeigler NIH-07 < B6 fed AIN-76A or B6 fed AIN-93G; 129 fed Purina 5015 > 129 fed Purina 5001 or 129 fed AIN-76A.