Unit 5: The Carbohydrates: Sugar, Starch , And Fibre Flashcards
(124 cards)
What do nutrition professionals recommend in terms of carbohydrates
They say higher carbs are better
What are carbohydrates
Compounds made of single or multiple sugars. The name means carbon and water
These are the ideal nutrients to meet the bodies needs
Chemical name is CHO
What are digestible carbs and indigestible carbs
Digestible: add bulk to foods and give energy and other benefits to the body
Indigestible carbs : include most fibre in foods, give no energy but still give of benefits
What are the three main categories of carbohydrates
Simple carbs/simple sugars:
- both single sugars (monosaccharides) and linked pairs of sugars (disaccharides)
- ex. Added or free sugars
- ex. Glucose fructose and galactose (mono), sucrose maltose and lactose (di)
Complex carbs:
- long chains of sugars (polysaccharides)
- ex. Starch and fibre
What are added sugars and free sugars
Both are simple carbs
Added sugar:
- mono or disaccharides added to drinks or food
- also added concentrated sugars like syrups
Free sugars:
- the added sugars plus sugar that are naturally in fruit juices
Chemical formula of glucose
Galactose
Fructose
C6H12O6
Just arranged diff
How many bonds can
C
N
O
H
Form
4
3
2
1
What are the major elements found in nutrients
C H O N
In which nutrients do nitrogen occur
Only in protiens and some B vitamins
What is photosynthesis and what elements combine in photosynthesis to make glucose
Process where green plants make carbs (mainly glucose) from CO2 and H2O using chlorophyll and the suns energy
The suns energy in photosynthesis is stored as chemical energy in the binds of glucose molecules
Gluscose formed when:
- water from root gives hydrogen and oxygen, co2 absorbed into the leaves give carbon and oxygen
- water and co2 combined to make glucose
What is chlorophyll
Green pigment in plants that captures the suns light energy needed for photosynthesis
What is meant by “sugars” and “glucose”
Sugars: simple carbs, usually referred as sucrose
Glucose:
- single sugar used for energy in plant and animal tissues
- also known as dextrose or blood sugar (glucose in the blood)
Why is glucose important for plants
Why is plant made carbohydrate energy important for humans and animals
After horosynthsis ehich make glucose , the glucose Fuels the growth repair and maintenance of all plant parts (stem roots leaves flowers fruits)
Since plants don’t use all the energy stored in their sugars, the leftover energy is avaible to human and animal consumers when they eat the plant
What is the primary source of carb rich foods
Plants
The other source from animals is milk which has lactose
Four major forms of carbs in foods
Sugars
- six of them, 3 mono, 3 di
Starch
Glycogen
Fibre
Ose means
Sugar
What are the most common monosaccharides in nature
Glucose and fructose
What are
Fructose
Galactose
Lactose
Maltose
Sucrose
Fructose :
- mostly in fruits and honey, sometimes known as fruit sugar
Galactose:
Part of the disaccharide lactose
Lactose :
- made of glucose and lactose, sometimes known as milk sugar
Maltose
- appears where ever starch is being broken down in the body
- two glucose
Sucrose
- table sugar, but also occurs naturally in veggies and fruits, sweet because it is has fructose
- glucose and fructose
What happens to single sugars when you eat them
What has to happen to disaccharides before they can be absorbed
After absorbed into the blood where to these sugars go
Absorbed directly into the blood without need to be broken down
Digestive enzymes in the small intestine split Disaccharides into mono, then absorbed
After absorbed, blood takes them to the liver which has enzymes to modifiy the sugar and make them useful to the body
- because glucose is the main monosaccharide used, the liver converts fructose and galactose into glucose or smaller things that can make glucose
Why are fruits and veggies different from candy or soda even though both have sugar
Frits and veggies provide fibre, vitamins, and phytochemical
But stuff in soda and candy have concentration sugar with little nutritional value
What is starch
A polysaccharide (like glycogen and most fibres) which are strands of many sugars . also called complex carbs
Starch specifically is a glucose polysaccharide, ie the storage from of glucose in plants
Why do plants store starch instead of glucose
To store energy in their seeds for the next generation
Ex. A mature corn stores the glucose as starch in things called granules and pack those granule into its seeds
Also starch is insoluble in water and will stay in the seed when it rains , unlike glucose which isn’t soluble
What are strach granules
Small grains that package starch molecules
What is glycogen
Storage from of glucose in animals and humans :
- Highly branched polysaccharide made of glucose that’s stored and made by liver and muscle tissues of humans and animals
Unlike starch being abundant in plants, glycogen is not found in meats because it breaks down rapidly when the animal is slaughtered
Glycogen is not a significant source of carbohydrate and isn’t counted as a complex carbohydrate