1 / 9

A Balanced Diet

A Balanced Diet. A balanced diet is the correct mixture and amount of the five food groups. They are: Proteins e.g.Beans, meat & poultry Fats e.g.Cheese milk & butter Carbohydrates: Pasta, rice and cakes. Vitamins:e.g. A,B,B12,C,E&D Minerals:e.g.Ca,Fe, Zn & I etc. Carbohydrates.

morley
Download Presentation

A Balanced Diet

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Balanced Diet • A balanced diet is the correct mixture and amount of the five food groups. • They are: • Proteins e.g.Beans, meat & poultry • Fats e.g.Cheese milk & butter • Carbohydrates: Pasta, rice and cakes. • Vitamins:e.g. A,B,B12,C,E&D • Minerals:e.g.Ca,Fe, Zn & I etc.

  2. Carbohydrates • Carbohydrates are made up of three elements only i.e. Carbon, hydrogen and oxygen. • They have a General Formula of(C)x(H2O)y • Carbohydrates provide our bodies with energy.

  3. 1. Monosaccharides (the simplest sugars) e.g. Glucose and Fructose, both have formula C6H12O6 ie Isomers 2.Disaccharides e.g Sucrose & Maltose(made from two monosaccharides joining together) There are 3 groups of Carbohydrate

  4. 3. Polysaccharides ( made up many monosaccharides joining together) egStarch & Cellulose.Approx 300 glucose units join together to make Starch. They join together by means of a CONDENSATION Reaction i.e.the removal of water molecules between monosaccharides. The Formula of starch is -(C6H10O5)n-

  5. Tests for Carbohydrates • Test for Glucose: Add Benedicts solution and heat in a water – bath. If glucose is present the solution will turn from blue to orange (brick-red). This also works for Fructose(which is an Isomer of glucose) Test for Starch:Add Iodinesolution. If Starch is present it will turn Blue/Black. There is no “practical”test for sucrose

  6. Breaking Carbohydrates Up Starch • Monosaccharides join by the removal of water molecules .i.e.a Condensation Reaction. • To break up Carbohydrates we ADD water.This is called Hydrolysis. • Instead of water our bodies use Hydrochloric Acid Glucose molecules

  7. Digestion of Food • For us to receive the benefit of food it must be absorbed into our bloodstream. • Digestion happens in a number of stages: • First broken down in mouth by chewing and use of Enzymes in saliva. • Passes down gullet into stomach where Hydrolysis begins (stomach contains Hydrochloric Acid). • Begins long journey through Small Intestine(22-26ft) and then into large intestine(4-6ft) where it finally absorbed into the blood.

  8. Digestion(contd). • The large Intestine or Gut can be regarded a long tube which contains tiny pores. • For the food to get through to the other side i.e. the bloodstream the food molecules must be broken up into small enough units. • For example Starch must be broken into Glucose molecules.

  9. Alkanols (Alcohols) • The Alkanols are another Homologous series with General Formula CnH2n+1OH • Alkanols are generally used as solvents and cleaning agents. • Ethanol is the alkanol that is present in all alcoholic drinks. • It is made by a process called Fermentation in which sugar is turned into alcohol yeast C6H12O6 C2H5OH + CO2 Yeast acts as a Catalyst since it contains Enzymes (a Biological Catalyst) which will only work at a specific pH and Temperature The mixture is finally Distilled to purify it

More Related