a diet that contains the right amount of different nutrients to keep you alive

What can happen if your diet is too high in energy without burning it off

a diet high in sugar can cause this disease

A situation where (a) a person is not getting enough of a certain nutrient and (b) this is causing a health problem.

this is needed for your cell membranes, but too high a level of it can cause heart disease

the speed of the chemical reactions in your cells.

can affect your metabolic rate

more of this can increase your metabolic rate and help you lose body mass

cause disease by reproducing and producing toxins which make you feel ill

smaller than bacteria, these cause disease by entering a cell, reproducing and then leaving the cell.

Made the doctors wash their hands, killing the pathogens responsible for "childbed fever"

the blood cells responsible for destroying pathogens

special proteins on the surface of microorganisms

proteins made by your body to help remove pathogens

a medicine that kills bacteria - it does not work on viruses

discovered penicillin.

a nutrient medium used to grow microorganisms

An antibiotic resistant bacteria which spreads easily through hospitals - so wash your hands!

made of a weakened/dead version of the pathogen. This causes your body to produce antibodies, making you immune.