You get a deficiency disease ... a different one for each element you lack.
When oxygen is insufficient the body cannot depend on the next step which is acetyl CoA, this enhances metabolism and it goes to the next step which is TCA cycle, here the body's metabolism is working to make more ATP. This is fuel for the body.
Then your body would no longer exist.
You might gat a heart attack since insufficient blood passes through.
It develops in children and adults whose consumption of protein and energy (measured by calories) is insufficient to satisfy the body's nutritional needs.
Dehydration.
Dehydration
Ischaemia
If you had insufficient red blood cells, your body would not get the oxygen that it needs. This is because red blood cells are what carries oxygen around the body.
you would dehydrate and die
there are 25 elements in the human body.
anemia
body temperature