There are a large variety of physical activity monitors,
including simple pedometers,
consumer-grade devices like the
Nike's Fuel Band,
and professional-grade devices like the
These devices provide a measure of energy expenditure.
The Bite Counter is similar but is the only device of its kind to
provide an automated measure of energy intake.
How good is the measure?
The plot below on the left shows the histogram of correlations for all 83 participants in the study described above.
To provide context, the plot below on the right shows a histogram of correlations found in a meta-study evaluation of 41 studies that compared energy expenditure as measured by physical activity monitors to doubly labeled water (Westerterp & Plasqui, 2007, "Physical Activity Assessment with Accelerometers: An Evaluation against Doubly Labeled Water", in Obesity, vol 15, pp 2371-2379).
As can be seen, the Bite Counter provides a measure of energy intake
comparable in quality to the measure of energy expenditure provided
by physical activity monitors.