# data[].attributes.body
- There are over 100,000 different types of protein
- Proteins are made up of a number amino acids. The human body can only produce about half of these naturally, and the rest can only be absorbed through diet
- The lifespan of most proteins averages less than two days
- Protein is the 2nd most abundant substance in the human body behind water. It is found in every single cell in your body.

# data[].attributes.body
- Proteins in the blood. E.g. hemoglobin
- Needed in growth stages of life and maintenance of body stores is required.
- Found in eggs, organs, skins. We cannot function without protein.
- Essential amino acids vs non-essential amino acids

# data[].attributes.body
- Consists of amino acids.
- Helps the body grow or repair tissue.
- Makes enzymes, antibodies and hormones.
amino acids vs non-essential amino acid

# data[].attributes.body
Infants
0-6 months: 10g (1.43 g/kg body weight)
7-12 months: 14g (1.60 g/kg body weight)

Children and adolescents
All
1–3 yr: 14 g/day (1.08 g/kg)
4–8 yr: 20 g/day (0.91 g/kg)
Boys
9–13 yr: 40 g/day (0.94 g/kg)
14–18 yr: 65 g/day (0.99 g/kg)
Girls
9–13 yr: 35 g/day (0.87 g/kg)
14–18 yr: 45 g/day (0.77 g/kg)

Adults
Men
19–30 yr: 64 g/day (0.84 g/kg)
31–50 yr: 64 g/day (0.84 g/kg)
51–70 yr: 64 g/day (0.84 g/kg)
>70 yr: 81g/day (1.07 g/kg)
Women
19–30 yr: 46 g/day (0.75 g/kg)
31–50 yr: 46 g/day (0.75 g/kg)
51–70 yr: 46 g/day (0.75 g/kg)
>70 yr: 57 g/day (0.94 g/kg)

Pregnancy
(2nd and 3rd trimesters)
14–18 yr: 58 g/day (1.02 g/kg)
19–30 yr: 60 g/day (1.00 g/kg)
31–50 yr: 60 g/day (1.00 g/kg)

Lactation
14–18 yr: 63 g/day (1.1 g/kg)
19–30 yr: 67 g/day (1.1 g/kg)
31–50 yr: 67 g/day (1.1 g/kg)

# data[].attributes.body
17kJ/g
For every gram of protein, there are 17kJ, the same as carbohydrates and almost half as fats.

# data[].attributes.body
- Proteins are a chain of amino acids, linked from the n terminus to c terminus
- Amino acids have different side chains which determine function and reactivity
- Proteases break proteins down into small peptides or amino acids
- Proteins have primary structures and may have Secondary, Tertiary and Quaternary structures that increase their complexity and function
- Proteins can form alpha helices, beta barrels, beta sheets