Data on the calorific content of foods can be found in the McCance and Widdowson's ‘The Composition of Foods’ series. Latest data from this series published in 2002 are set out in the following table.
Food Energy (kcal/100g) Orange juice, unsweetened 136 Water 0 Low calorie carbonated drinks e.g. diet cola 11 Fruit smoothies 242-94 1 Data are an average figure for a composite sample of products available on the market at the time of analysis. 2 Fruit smoothies have not yet been analysed for The Composition of Foods. Information made available by market leaders suggest energy values in this range, depending on products formulation. Source: Food Standards Agency (2002) McCance and Widdowson's ‘The Composition of Foods’, Sixth summary edition. Cambridge: Royal Society of Chemistry.
The Government have no plans to commission an assessment of the hydration properties of certain fluids.
The Food Standards Agency advises people to consume 6 to 8 glasses (1.2 litres) of water, or other fluids, every day to prevent dehydration. This amount should be increased when the weather is warm or when exercising.