What I understand from this Brother Eli's video:
It is the disobedience and sin of man that have brought suffering in the earth. God created man in his image and likeness, and there was no evil, death or sicknesses when God created man.
Genesis 2:16-17 says God gave man authority to eat all the fruits in Eden except that of the tree of knowledge of good and evil. Death came because of sin, according to Romans 5:12.
Everything Adam and Eve needed for good health was in the garden of Eden but, they disobeyed God. And, justice has to apply. Without justice, something goes wrong. If we go against equality and justice, we have to suffer the consequences. There must be a balance for things to be right.
For instance, studies have shown that there were higher percentages of oxygen many years ago than in the present era. The presence of many viruses and bacteria can be related to the less quality of oxygen now. High oxygen concentration kill microorganisms.
This is why hydrogen peroxide and ozone which produce oxygen are introduced to destroy microorganisms. The less percentage of oxygen now is due to too much burning of fuel and consequent releasing of carbon dioxide and carbon monoxide into the atmosphere.