defency in Vitamin A is leading cause of blindness worldwide

There is currently no way to prevent complement deficiencies.

These are all summed generalisations

Vitamin C deficiencies leads to scurvy

Iron deficiencies leads to fatigue

Vitamin D deficiencies lead to a bad immune system

Protein deficiencies lead to bad muscle growth and weakness

Fibre deficiencies leads to clogged up bowels, which cause constipation

Vitamin B deficiencies lead to nervous system damage, acne, depression, birth defects and weight lost

Vitamin A deficiencies will lead to possible blindness, since it affects the retina, and abnormal bone growth

Sugar deficiencies lead to lack of energy, possibly, not sure on that one

I hope I've covered the common ones!

These are all summed generalisations

Vitamin C deficiencies leads to scurvy

Iron deficiencies leads to fatigue

Vitamin D deficiencies lead to a bad immune system

Protein deficiencies lead to bad muscle growth and weakness

Fibre deficiencies leads to clogged up bowels, which cause constipation

Vitamin B deficiencies lead to nervous system damage, acne, depression, birth defects and weight lost

Vitamin A deficiencies will lead to possible blindness, since it affects the retina, and abnormal bone growth

Sugar deficiencies lead to lack of energy, possibly, not sure on that one

I hope I've covered the common ones!