Worra, of course people have always had hormones - what they haven't had is tonnes & tonnes of cheap sugars & refined carbohydrate to eat.
There was research done about the Pima Indians early twentieth century to try and understand how they had gone from being a healthy, lean population to very unhealthy & fat. Turned out that once they had all been herded into a reservation and could no longer hunt to nourish themselves, they also started to receive government rations of flour, sugar, coffee & some tinned foods. All of a sudden they got fat & malnourished, even though alot of them were involved in hard manual labour.
The point here is that our bodies were never designed to cope with the level of sugars & carbohydrates that we ingest nowadays. Our bodies have developed over hundreds and thousands of years & for the majority of that period we ate animals/fish and fruits, seeds, grains, leaves & tubers etc when they were available - which would have been for fairly short periods of the year. The most nourishing source of food was from animals & fish.
So, that is what our digestion & hormones have had hundreds of thousands of years to learn to cope with. It is only in the last 1000 years that modern agriculture & farming has really taken off & it is only in the last 100 years that industrial farming has become available, making wheat & sugar as cheap as they now are. If you look at statistics the consumption of sugars, high fructose corn syrup & wheat based products has trebled or more in that period!
This is why we create the hormonal disorder that leads to over storing fat. We chuck out bucket loads of insulin to try and keep our blood sugar stable every time we eat all these sugars & carbs & insulin is the primary fat storing hormone/chemical in the body - so - we get fat!!!