The O2shape program combines the use of a protein-based smoothie with an uphill walking routine. This increases oxygen (O2) uptake from the lungs, as well as muscular capacity. 

The smoothie increase the feeling of fullness, thus reducing total daily calorie intake. It also increase the effects of exercise with 25%.

The research referred to is published in major medical journals and can be found by searching for "Hoff and Helgerud" on PubMed.gov - the major database for peer-reviewed medical research.

The key measurements for health and physiological ageing are Oxygen Uptake (the body's ability to take up the oxygen we breathe), as well as Heart Capacity (size and effectiveness of heart muscles).

Oxygen uptake has a grey column, while Heart Capacity has red. 

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The figure shows the source the body use for producing the energy we need in our daily lives. Within 8 weeks, the body will gradually start using fat-reserves as the main source for energy, rather than carbohydrates.

This shift in metabolism is very beneficial for reducing body-fat, as metabolism works 24-hours a day.

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