...maintain long-term. Lose weight by eating fat? It seems to go against everything we have ever been told, but there is an explanation. Agriculture and farming were only invented about 10,000 years ago - the day before yesterday, in the history of the ... studies, the ketogenic diets or those which are very low in carbohydrates tend to be more effective than others to lose weight in the short to medium term," says Luis Jiménez. The problem, he points out, is that a strict ketogenic diet means that many foods ... carbohydrates to lose weight? Starting from the premise that obesity is even less healthy - in Spain obesity is, after smoking, the second cause of preventable death from diabetes, cancer and cardiovascular illness - the option is not to be entirely discounted.