In response to my recent article (Johnson, 2015), Wallace and Howlett have provided a thoughtful commentary pointing out that aging might be defined not just by the passage of time, but by the accumulation of defects in multiple regions throughout the organism that can be represented by a frailty index (Wallace and Howlett, 2016). It occurs to me that this approach might help overcome two major...

Tumor promotion associated with increased dietary fat may be inhibited by reduction in total caloric intake. This hypothesis was tested in rats given either 7,12-dimethylbenz(a)anthracene to induce mammary tumors or 1,2-dimethylhydrazine to induce colon tumors. One week after dosage with either carcinogen, the rats were fed semipurified diets that provided 4% fat with ad libitum calories or 13....

Tumor promotion associated with increased dietary fat may be inhib ited by reduction in total caloric intake. This hypothesis was tested in rats given either 7,12-dimethylbenz(fl)anthracene to induce mammary tumors or 1,2-dimethylhydrazine to induce colon tumors. One week after dosage with either carcinogen, the rats were fed semipurified diets that provided 4% fat with ad libitum calories or 1...

1. Lean (Fa/-) and obese (fa/fa) Zucker rats were adrenalectomized or sham-operated at 18 d of age (3 d before weaning). After weaning the rats were fed ad lib. on semi-synthetic diets containing either a low (8 g/kg) or a high (178 g/kg) proportion of fat. Other groups of sham-operated rats were given the same amount eaten by adrenalectomized animals (restricted intake). Rats were killed at 40...

Liver content of pentose-cycle intermediates and the activity of the three major cytoplasmic NADPH-producing enzymes and pentose-cycle enzymes were measured in three dietary states: 48 h-starved rats, rats fed on a standard diet ad libitum, and rats meal-fed with a low-fat high-carbohydrate diet. Measured tissue contents of pentose-cycle intermediates in starved liver were: 6-phosphogluconate, ...

________________________________________________________________________________ Abstract The study tested the performance of intact male pigs from a selected genetic line subjected to differing feeding regimens and penning conditions. The trial was a 2 x 3 x 2 x 3 factorial design, consisting of winter and summer periods, three sire lines, two diets and three feeding regimens. The pigs were in...

Feeding sheep concentrate-based diets increases the oleic acid content of their tissues, whereas the cis-9, trans-11 conjugated linoleic acid (CLA) content is increased by feeding forage diets. Both these metabolic transformations could be attributable to increased activity of stearoyl-CoA desaturase (SCD). Therefore, the effect of forage or concentrate feeding regimens on the fatty acid compos...

Abstract Leptin plays a major role in the regulation of energy intake and expenditure, triggering effects on several tissues, such as hypothalamic-pituitary-thyroid axis. The reported leptin thyroid are controversial, being mainly explored during imbalance. Therefore, aim this study was to evaluate function rats fed ad libitum distinguishing direct responses from those mediated by leptin-depend...