Good analysis by Sean Duggan. I would like to take a look at Thermogenesis a bit closer.
Let's start with Metabolism
Metabolism refers to biochemical processes that occur with any living
organism - including humans - to maintain life. These biochemical
processes allow us to grow, reproduce, repair damage, and respond to
Anabolism and catabolism
Anabolism is the building up of things - a succession of chemical
reactions that constructs or synthesizes molecules from smaller
components, usually requiring energy in the process.
Catabolism is the breaking down of things - a series of degradative
chemical reactions that break down complex molecules into smaller
units, and in most cases releasing energy in the process.
Metabolism and body weight
In simple terms, our body weight is a result of catabolism minus
anabolism. In other words, the amount of energy we release into our
bodies (catabolism) minus the amount of energy our bodies use up
The excess energy is stored either as fat or glycogen (stored as
carbohydrate mostly in the liver, and also in the muscles).
One gram of fat produces 9 calories (kcal), compared to 4 kcal from
protein or carbohydrate.
What is metabolism? How do anabolism and catabolism affect body weight?
BMR and RMR
The basal metabolic rate (BMR) represents the energy needed to support the basic cost of living.
The BMR is typically measured in the morning after an overnight fast
and lying down for 30 minutes
RMR (Resting Metabolic Rate) is any time of day
The largest number of calories expended by most people (except for
athletes during heavy training) is from the resting metabolic rate
Your Metabolism: Facts and Fables
According to this study (refers to changes in RMR levels):
The novel finding in this study is that drinking 500 ml of water
increases metabolic rate by 30% in both men and in women. The increase
in metabolic rate was observed within 10 min after completion and
reached a maximum 30–40 min after water drinking. The effect was
sustained for more than an hour.
Based on our measurements, we estimate that increasing water
ingestion by 1.5 liters would augment daily energy expenditure by
approximately 200 kJ. Over 1 yr, energy expenditure would increase by
73,000 kJ (17,400 kcal), the energy content of 2.4 kg adipose tissue.
adipose tissue = fat
My conclusion as far as I understood this topic: Drinking water does increase metabolic rate for a short period of time, contributing to the additional energy expenditure of the human body (ie burning calories).