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Each person has slightly differently amino acid sequences which makes up the proteins in our bodies. The information of the sequences are filed in the DNA.

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Proteins have different structures. It depends on the function.

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Helps us repair our tissues

Building materials for growth and repair

Makes enzymes, antibodies and hormones

Facilitates chemical reactions and regulates body processes

Maintenance of damaged or dead cells

Regulates the body's fluid balance

We cannot function without protein

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For a normal adult, the daily protein intake is 1.16g/ kg, which means that a person weighing 60kg needs a minimum of about 70g/day.

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energy release about 17KJ/g (really low efficiency)

Protein is a last-ditch fuel store
We don't "store" protein. It all has a function
Making protein has cost us a lot of energy

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Lean Meats

Poultry

Fish and Seafood

Dairy

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Protein is made of amino acids, and in total, it has 20 different kinds of amino acids in nature.

Amino acids can be divided into essential amino acids (9 kinds) and non-essential amino acids (11 kinds). The human being should digest non-essential amino acids cause our body can not produce them.

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Good effects
- Antibodies can bind to and inactivate foreign substances such as pathogens and toxins (neutralization).  Also, antibodies activate the complement system to destroy bacterial cells by lysis (punching holes in the cell wall).

- Hormone. Some proteins act as hormones and adjust our body homeostasis. For example, insulin can adjust our blood sugar levels.

- Most proteins are enzymes. It relates to our daily life.

Bad effects
- Eating too much protein would cause many diseases, such as kidney damage and some kinds of cancer.

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- Calcium

- Iron

- Zinc

- Iodine