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I believe that energy loss through breathing has been too long neglected by nutritionists, but don't think that is necessary to postulate increased oxygen uptake by cells by deep breathing etc., to explain the differences in metabolic rates between individuals. If you do a simple psychometric calculation, which takes inhaled breath at ambient temperature and humidity, and assumes that the exhaled air is just below body temperature and at about 90% relative humidity, the increase in heat content, or enthalpy, accounts for about 30% of the body's energy intake, assuming an average breathing rate of 1 cub ft/min - I'll send a copy of the calculations by private e-mail to any one who wants them. This loss of energy from the body is mainly due to the latent heat of evaporation as liquid water is transferred from the lung surfaces to evaporated water in the outgoing breath. I believe that a major cause of the differences in metabolic rate between individuals could be due to variations in their breathing patterns (the weight of air breathed per minute) and to their efficiency of mass transfer between the moisture in their lungs to evaporated water in the exhaled air, but have never been able to persuade anyone with the facilities to do the necessary research work to follow up this suggestion. This mechanism could explain why Pam Grout lost some, if not all, of her 10 lbs with deep breathing.exercises. Ray Lakin