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Starch is the most common carbohydrate in the human diet and is contained in many staple foods. The major sources of starch intake worldwide are the cereals (rice, wheat, and maize) and the root vegetables (potatoes and cassava). [41]
Amylose A is a parallel double-helix of linear chains of glucose. Amylose is made up of α(1→4) bound glucose molecules. The carbon atoms on glucose are numbered, starting at the aldehyde (C=O) carbon, so, in amylose, the 1-carbon on one glucose molecule is linked to the 4-carbon on the next glucose molecule (α(1→4) bonds). [3]
The major sources of amylopectin of starch intake worldwide are the cereals such as rice, wheat, and maize, and the root vegetables potatoes and cassava. [25] Upon cooking, amylopectin in the starch is transformed into readily accessible glucose chains with very different nutritional and functional properties. [26]
Resistant starch is considered both a dietary fiber and a functional fiber, depending on whether it is naturally in foods or added. [ 51 ] [ 52 ] [ 53 ] Although the U.S. Institute of Medicine has defined total fiber as equal to functional fiber plus dietary fiber, [ 54 ] U.S. food labeling does not distinguish between them.
Glycogen is analogous to starch, a glucose polymer in plants, and is sometimes referred to as animal starch, [16] having a similar structure to amylopectin but more extensively branched and compact than starch. Glycogen is a polymer of α(1→4) glycosidic bonds linked with α(1→6)-linked branches.
Inulin-containing foods can be rather gassy, especially for those unaccustomed to inulin and these foods should be consumed in moderation at first. [ citation needed ] Inulin is a soluble fiber, one of three types of dietary fiber including soluble , insoluble and resistant starch .
Foods that contain large amounts of starch but little sugar, such as rice and potatoes, may acquire a slightly sweet taste as they are chewed because amylase degrades some of their starch into sugar. The pancreas and salivary gland make amylase ( alpha amylase ) to hydrolyse dietary starch into disaccharides and trisaccharides which are ...
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 ] Water makes up a large proportion of the total mass ingested as part of a normal diet but it does not provide any nutritional value.