It's the food we eat, the chemicals and above all the oil. Oil made out of seed is poison for the body. Omega 6 and 3 aren't in balance.
In the 60s and 70s, people were slim and eat way more fat.
Since butter, real milk and so on were called unhealthy and consuming oil, transfats increased so did overweight, heart attacks and cancer.
Back to basic, prepare your own food, stop with fast food and prepare meals and medication.

Fat cells can only shrink after puberty which means that instrument won't work in the long run.