Wednesday, 3 July 2013

Tracking Research: Chronic Intermittent Fasting Improves Cognitive Functions and Brain Structures in Mice

Tracking Research:  Chronic Intermittent Fasting Improves Cognitive Functions and Brain Structures in Mice
L Li, Z Wang, Z Zuo 

Obesity is a major health issue. Obesity started from teenagers has become a major health concern in recent years. Intermittent fasting increases the life span. However, it is not known whether obesity and intermittent fasting affect brain functions and structures before brain aging. Here, we subjected 7-week old CD-1 wild type male mice to intermittent (alternate-day) fasting or high fat diet (45% caloric supplied by fat) for 11 months. Mice on intermittent fasting had better learning and memory assessed by the Barnes maze and fear conditioning, thicker CA1 pyramidal cell layer, higher expression of drebrin, a dendritic protein, and lower oxidative stress than mice that had free access to regular diet (control mice). Mice fed with high fat diet was obese and with hyperlipidemia. They also had poorer exercise tolerance. However, these obese mice did not present significant learning and memory impairment or changes in brain structures or oxidative stress compared with control mice. These results suggest that intermittent fasting improves brain functions and structures and that high fat diet feeding started early in life does not cause significant changes in brain functions and structures in obese middle-aged animals.

The effects of various feeding protocols on leaning and memory.

Seven-week old male mice had free access to regular chow or high fat diet or were allowed to have free access to regular chow every other day (intermittent fasting) for 11 months. They were then subjected to Barnes maze, fear conditioning and rotarod tests. The results in the training sessions and memory phase of the Barnes maze are presented in panels A and B. The fear conditioning and rotarod results are shown in panels C and D, respectively. Results are means ± S.E.M (n = 15 – 35). * P<0.05 compared with mice on regular chow ad libitum.

 HDL: high density lipoprotein; LDL: low density lipoprotein.  The time for mice in all three groups to get into the target box in the Barnes maze
test became shorter with increased training sessions. ... Barnes maze. ...


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