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Included for each food is its weight in grams, its calories, and (also in grams,) the amount of protein, carbohydrates, dietary fiber, fat, and saturated fat. [1] As foods vary by brands and stores, the figures should only be considered estimates, with more exact figures often included on product labels.
Macronutrients are defined as a class of chemical compounds which humans consume in relatively large quantities compared to vitamins and minerals which provide humans with energy. Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per gram) proteins and carbohydrates 17 kJ/g (4 kcal/g). [2]
Pure ethanol provides 7 calories per gram. For distilled spirits , a standard serving in the United States is 1.5 fluid ounces, which at 40% ethanol (80 proof), would be 14 grams and 98 calories. [ 90 ]
For example, fat (triglyceride lipids) contains 9 kilocalories per gram (kcal/g), while carbohydrates (sugar and starch) and protein contain approximately 4 kcal/g. [29] Alcohol in food contains 7 kcal/g. [30] The "large" unit is also used to express recommended nutritional intake or consumption, as in "calories per day".
The GDA labels have the percentage of daily value per serving and the absolute amount per serving of these categories. The front-of-packages (FOP) GDAs must at least have calories listed, but the back-of-package (BOP) GDAs must list, at a minimum, these five key nutrients: Energy, Fat, Saturates, Sugar and Salt. [ 2 ]
As of 2009, "McDonald's top tuber is the Russet Burbank". [5] The russet Burbank is more expensive than other potatoes, as it consumes more water and takes longer to mature, while it also requires large amounts of pesticides. [5] [6] Varieties with high levels of starch, like russet potatoes, are well-suited to baking and mashing. [1]
The United States Department of Agriculture uses a figure of 6.93 kilocalories (29.0 kJ) per gram of alcohol (5.47 kcal or 22.9 kJ per ml) for calculating food energy. [4] For distilled spirits , a standard serving in the U.S. is 44 ml (1.5 US fl oz), which at 40% ethanol (80 proof ) would be 14 grams and 98 calories.
For an overall efficiency of 20%, one watt of mechanical power is equivalent to 18 kJ/h (4.3 kcal/h). For example, a manufacturer of rowing equipment shows calories released from "burning" food as four times the actual mechanical work, plus 1,300 kJ (300 kcal) per hour, [16] which amounts to about 20% efficiency at 250 watts of mechanical output.