Big corporations use marketing to trick us into thinking that the solution to all our problems lies in buying more of their stuff. The real solution is often the exact opposite: it consists in consuming less, not more. In most cases, our problems are caused by overconsumption in the first place.   For example, if you are overweight, you will be bombarded with ads for gym subscriptions or food supplements. But the key to losing weight is eating less – not new shoes and protein powder.   Or, if you struggle with…