High- or low-salt diet from weaning to adulthood: Effect on body weight, food intake and energy balance in rats

• Published in: Nutrition, metabolism, and cardiovascular diseases Vol. 16; no. 2; pp. 148 - 155
• Main Authors: Coêlho, Michella S., Passadore, Mariana D., Gasparetti, Alessandra L., Bibancos, Theo, Prada, Patrícia O., Furukawa, Luciene L., Furukawa, Luzia N.S., Fukui, Rosa T., Casarini, Dulce E., Saad, Mario J.A., Luz, Jacqueline, Chiavegatto, Silvana, Dolnikoff, Miriam S., Heimann, Joel C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.03.2006
• Subjects: Adipose Tissue, Brown - metabolism; Angiotensin II; Angiotensin II - metabolism; Animals; Blood pressure; Body weight; Body Weight - drug effects; Body Weight - physiology; Carrier Proteins - metabolism; Diet, Sodium-Restricted; Dose-Response Relationship, Drug; Eating - drug effects; Eating - physiology; Energy expenditure; Energy Intake - drug effects; Energy Intake - physiology; Energy Metabolism - drug effects; Energy Metabolism - physiology; Hormones; Hypertension - diet therapy; Ion Channels; Male; Membrane Proteins - metabolism; Mitochondrial Proteins; Motor Activity - drug effects; Motor Activity - physiology; Rats; Rats, Wistar; Sodium; Sodium Chloride, Dietary - administration & dosage; Thyroid Hormones - blood; Time Factors; Uncoupling Protein 1; Weaning; T4; GLUTs; LO; SGLTs; Body weight; Energy expenditure; TSH; UCP1; Hormones; WAT; BP; ANG II; RE; Sodium; BAT; HSD; SNS; Blood pressure; Angiotensin II; LSD; NSD; T3
• ISSN: 0939-4753; 1590-3729
• DOI: 10.1016/j.numecd.2005.09.001

To get some additional insight on the mechanisms of the effect of salt intake on body weight. Rats were fed a low (LSD), normal (NSD), or high (HSD) salt diet. In a first set, body weight, tail-cuff blood pressure, fasting plasma thyroid-stimulating hormone, triiodothyronine, l-thyroxine, glucose, insulin, and angiotensin II were measured. Angiotensin II content was determined in white and brown adipose tissues. Uncoupling protein 1 expression was measured in brown adipose tissue. In a second set, body weight, food intake, energy balance, and plasma leptin were determined. In a third set of rats, motor activity and body weight were evaluated. Blood pressure increased on HSD. Body weight was similar among groups at weaning, but during adulthood it was lower on HSD and higher on LSD. Food intake, l-thyroxine concentration, uncoupling protein 1 expression and energy expenditure were higher in HSD rats, while non-fasting leptin concentration was lower in these groups compared to NSD and LSD animals. Plasma thyroid-stimulating hormone decreased on both HSD and LSD while plasma glucose and insulin were elevated only on LSD. A decrease in plasma angiotensin II was observed in HSD rats. On LSD, an increase in brown adipose tissue angiotensin II content was associated to decreased uncoupling protein 1 expression and energy expenditure. In this group, a low angiotensin II content in white adipose tissue was also found. Motor activity was not influenced by the dietary salt content. Chronic alteration in salt intake is associated with changes in body weight, food intake, hormonal profile, and energy expenditure and tissue angiotensin II content.