Does faster metabolism mean shorter life?

As metabolic rate increases the lifespan of an organism is expected to decrease as well.

en.wikipedia.org - Rate-of-living theory - Wikipedia

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Theory of biological ageing

As metabolic rate increases the lifespan of an organism is expected to decrease as well. The rate at which this occurs is not fixed and thus the -45° slope in this graph is just an example and not a constant. The rate of living theory postulates that the faster an organism’s metabolism, the shorter its lifespan. The theory was originally created by Max Rubner in 1908 after his observation that larger animals outlived smaller ones, and that the larger animals had slower metabolisms.[1] After its inception by Rubner, it was further expanded upon through the work of Raymond Pearl. Outlined in his book, The Rate of Living published in 1928, Pearl conducted a series of experiments in drosophila and cantaloupe seeds that corroborated Rubner’s initial observation that a slowing of metabolism increased lifespan.[2] Further strength was given to these observations by the discovery of Max Kleiber’s law in 1932. Colloquially called the “mouse-to-elephant” curve, Kleiber’s conclusion was that basal metabolic rate could accurately be predicted by taking 3/4 the power of body weight. This conclusion was especially noteworthy because the inversion of its scaling exponent, between 0.2 and 0.33, was the scaling for lifespan and metabolic rate.[3]

Mechanism [ edit ]

Mechanistic evidence was provided by Denham Harman's free radical theory of aging, created in the 1950s. This theory stated that organisms age over time due to the accumulation of damage from free radicals in the body.[4] It also showed that metabolic processes, specifically the mitochondria, are prominent producers of free radicals.[4] This provided a mechanistic link between Rubner's initial observations of decreased lifespan in conjunction with increased metabolism.

Current state of theory [ edit ]

Support for this theory has been bolstered by studies linking a lower basal metabolic rate (evident with a lowered heartbeat) to increased life expectancy.[5][6][7] This has been proposed by some to be the key to why animals like the Giant Tortoise can live over 150 years.[8] However, the ratio of resting metabolic rate to total daily energy expenditure can vary between 1.6 and 8.0 between species of mammals. Animals also vary in the degree of coupling between oxidative phosphorylation and ATP production, the amount of saturated fat in mitochondrial membranes, the amount of DNA repair, and many other factors that affect maximum life span.[9] Furthermore, a number of species with high metabolic rate, like bats and birds, are long-lived.[10][11] In a 2007 analysis it was shown that, when modern statistical methods for correcting for the effects of body size and phylogeny are employed, metabolic rate does not correlate with longevity in mammals or birds.[12]

• DNA damage theory of aging

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What happens to your face when you stop drinking coffee?

Quitting coffee can increase the growth of collagen and makes look healthy and makes it glow. Moreover, the dehydration can cause premature aging and a caffeine detox can lead to a beautiful change in your skin quality. Coffee can also increase oil production in the skin and cause our pores to get clogged due to this.

pinkvilla.com - THIS is what happens to your skin when you quit drinking coffee

A shot of caffeine can wake you right up in the morning and there are many of us who can’t help but turn to a cup of caffeine every morning. Many of us find it nearly impossible to wake up properly or stay up after waking up without our daily dose of coffee. Coffee can be addictive and it can keep us up and alert. It helps increase our concentration and beat stress. It keeps us going on days when we feel too lazy or lethargic to work. But that’s not the only thing that caffeine does to us. All that caffeine we consume can have a lasting effect on our body and mind. But that’s not all, other than making your anxious and jittery, coffee also impacts our skin in a big way. Consuming caffeine is not wrong as long as it is consumed moderately. A high intake of caffeine can affect your skin and can even lead to dry dehydrated skin or even acne. Not all of us have skin that can handle too much coffee. Many people have a skin that is sensitive and prone to acne if that’s how your skin is you need to limit your caffeine intake. Caffeine impacts our hormones and it can increase the level of stress hormones which can cause a breakout. Even though coffee has milk or even water it can still dehydrate your skin. It works just like alcohol and makes us feel dehydrated and if it can make our lips feel dry, imagine what it can do to our skin!

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