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	Podcast:		Portable Practical Pediatrics
	Episode:		Dr. M’s SPA Newsletter Volume 14 Issue 50
	Category:		Kids & family
	Duration:		00:14:04
	Publish Date:		2025-02-18 05:55:02
	Description:		"Life forms on our planet have evolved under the strong influence of a daily light/dark cycle. Sunlight being the primary source of energy for photosynthesis, the daily production of photosynthetic biomass has a predictable diurnal rhythm. The daily cyclical production of photosynthesized chemical energy is at the base of the food chain. Daily changes in light and darkness result in diurnal rhythms in other environmental parameters such as temperature and humidity. Such a predictable and robust daily rhythm in food availability and environmental factors has led to the evolution of a ~24 h internal timing mechanism or circadian rhythm to enable organisms to anticipate daily changes and to optimize fitness. Fundamental to this 24 h rhythms is the ability to acquire food when it is available and to store a portion of these resources for utilization during the rest of the day (i.e. the fasting period) without compromising fitness and vitality. The fasting period also serves as a time for standby and repair so that the organism is fit and competent to harvest energy when light (for photosynthetic organisms) or food becomes available. While many non-photosynthetic lifeforms with short lifespan (
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