I have not heard this before so when I stumbled over an article online I thought I would share as we could all do with understanding metabolism and how to manipulate it.
Drinking lots of water is commonly espoused in weight loss regimens and is regarded as healthy; however, few systematic studies address this notion. In 14 healthy, normal-weight subjects (seven men and seven women), we assessed the effect of drinking 500 ml of water on energy expenditure and substrate oxidation rates by using whole-room indirect calorimetry. The effect of water drinking on adipose tissue metabolism was assessed with the microdialysis technique. Drinking 500 ml of water increased metabolic rate by 30%. The increase occurred within 10 min and reached a maximum after 30–40 min. The total thermogenic response was about 100 kJ. About 40% of the thermogenic effect originated from warming the water from 22 to 37 C. In men, lipids mainly fueled the increase in metabolic rate. In contrast, in women carbohydrates were mainly used as the energy source. The increase in energy expenditure with water was diminished with systemic β-adrenoreceptor blockade. Thus, drinking 2 liters of water per day would augment energy expenditure by approximately 400 kJ. Therefore, the thermogenic effect of water should be considered when estimating energy expenditure, particularly during weight loss programs.Michael Boschmann, Jochen Steiniger, Uta Hille, Jens Tank, Frauke Adams, Arya M. Sharma, Susanne Klaus, Friedrich C. Luft, Jens Jordan, Water-Induced Thermogenesis, The Journal of Clinical Endocrinology & Metabolism, Volume 88, Issue 12, 1 December 2003, Pages 6015–6019,
The whole article can be found at Endocrine Society website it is an old study but pertains to something so fundamental to us as humans that it is worth reading, and another very good reason to drink more water, even if we have have to warm it first!
Could well add to any intermittent fasting routines.