mortality/aging
• after 7 days on a calorie restricted diet (40% of normal consumption) mice are lethargic and nearly moribund
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homeostasis/metabolism
• in calorie restricted mice, blood glucose levels continue to decrease for 7 days reaching a low of 12 mg/dl while in wild-type mice blood glucose levels stabilize after 2 days
• in calorie restricted mice, infusion of ghrelin or growth hormone normalizes glucose levels so that they are similar to those in diet matched wild-type mice
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• ghrelin is not detectable in the plasma in either ad libitum fed or calorie restricted mice
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• in calorie restricted mice levels are 2 fold lower than in diet matched wild-type controls
• however, levels are similar to wild-type in ad libitum fed mice
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• modestly enhanced with a lower glucose levels and a slight but significant increase in plasma insulin at the 30 min time point
• high fat diet feeding glucose tolerance worsens but glucose levels are still lower and plasma insulin levels are higher than in diet matched wild-type
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