Intermittent fasting (IF) is a pattern of eating that alternates between periods of fasting (usually meaning consumption of water and sometimes low-calorie drinks such as black coffee) and non-fasting.
There is evidence suggesting that intermittent fasting may have beneficial effects on the health and longevity of animals—including humans—that are similar to the effects of caloric restriction
(CR). There is currently no consensus as to the degree to which this is
simply due to fasting or due to an (often) concomitant overall decrease
in calories, but recent studies have shown support for the former.[1][2] Alternate-day calorie restriction may prolong life span.[3]
Intermittent fasting and caloric restriction are forms of dietary
restriction (DR), which is sometimes referred to as dietary energy
restriction (DER).
Scientific study of intermittent fasting in rats (and anecdotally in humans) was carried out at least as early as 1943.[4]
A specific form of intermittent fasting is alternate day fasting (ADF), also referred to as every other day fasting (EOD), or every other day feeding (EODF), a 48-hour routine typically composed of a 24-hour fast followed by a 24-hour non-fasting period.
Insulin-like growth factor is produced in the liver and released
according to activity of Human Growth Hormone (HGH), produced in the
pituitary gland. Levels of both naturally decline with age, which is
desirable: high levels of IGF-1 encourage the body to focus on producing
new cells rather than existing repairing ones. As cellular and DNA
damage continues to go unchecked, aging and disease take hold. What's
more, cancerous cells usually mutate to take advantage of both insulin
and IGF-1, using them as fuel. The reverse is also true: in mice
genetically engineered to have low levels of IGF-1, lifespan increases
to the human equivalent of 120 years, and among the few hundred people
worldwide with low IGF-1, cancer and diabetes are virtually unknown.
- Anson, R. Michael; Guo, Zhihong; de Cabo, Rafael; Iyun, Titilola; Rios, Michelle; Hagepanos, Adrienne; Ingram, Donald K.; Lane, Mark A. et al. (2003). "Intermittent fasting dissociates beneficial effects of dietary restriction on glucose metabolism and neuronal resistance to injury from calorie intake". Proceedings of the National Academy of Sciences 100 (10): 6216–20. Bibcode:2003PNAS..100.6216A. doi:10.1073/pnas.1035720100. JSTOR 3147568. PMC 156352. PMID 12724520.
- Wan, R; Camandola, S; Mattson, MP (2003). "Intermittent food deprivation improves cardiovascular and neuroendocrine responses to stress in rats". The Journal of nutrition 133 (6): 1921–9. PMID 12771340.
- Johnson, James B.; Laub, Donald R.; John, Sujit (2006). "The effect on health of alternate day calorie restriction: Eating less and more than needed on alternate days prolongs life". Medical Hypotheses 67 (2): 209–11. doi:10.1016/j.mehy.2006.01.030. PMID 16529878.
- Carlson, AJ; Hoelzel, F (1946). "Apparent prolongation of the life span of rats by intermittent fasting". The Journal of nutrition 31: 363–75. PMID 21021020.
- en.wikipedia.org/wiki/Intermittent_fasting#cite_note-pmid12724520-1
- http://www.naturalnews.com/037474_intermittent_fasting_longevity_igf-1.html
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