Keto flu is a real thing. Cutting your carbs to the bone and going into a state of ketosis (where your body burns fat for energy) can bring on a cluster of uncomfortable symptoms, such as headaches, fatigue, muscle aches, nausea, and diarrhea. The side effects are the result of your body transitioning to using fat as its primary source of energy instead of carbs, explains Kristen Mancinelli, MS, RDN, author of The Ketogenic Diet. Once it adapts to the new fuel source (usually within a week or two), you’ll start to feel better.
It is no secret that Southern Europeans who eat a more Mediterranean Diet, consisting of vegetables, fruits, lots of fish and plenty of olive oil, have a higher life expectancy with fewer diseases. An average, Italians and Spaniards consume about 13 liters of olive oil per person per year. While the entire diet does play a big role in how healthy people are, it seems the use of extra virgin olive oil is the major contributing factor to longevity and health.
The health benefits of the Mediterranean diet are evident from both a medical and holistic perspective. While weight loss is not the primary intent of this diet, it’s an inherent effect from eating more plant-based foods while curbing sugar and red meat. Additionally, the high-fiber content of many whole grains, vegetables, fruits, and legumes found in the Mediterranean diet will help you feel fuller for longer, and reduce the chance of overeating. You’ll also pick up additional perks such as better digestive health and effective weight management. A Mediterranean diet can also be beneficial to those with type-2 diabetes by helping to lower blood glucose levels while promoting good HDL (high-density lipoprotein) cholesterol. Lastly, studies have also shown a link between the Mediterranean diet and long-term brain health. These health perks, combined with increased exercise and leisure-time, help earn the Mediterranean diet its reputation as a well rounded, logical, and realistic way to live.
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This meta-analysis also provides us with an explanation for why keto and low-carb diets have not always been found to confer better weight loss than low-fat diets. When protein and calories are controlled, changes in weight loss results remain relatively equal. This not only supports the theory that calorie deficits are the key to weight loss, but it also provides evidence against the hypothesis that carbs and insulin are the cause of obesity. 
It’s low in saturated fat. You’re not going to feel hungry eating this way, because you can build in a variety of healthy fats. But by limiting large amounts of red or processed meats and relying heavily on monounsaturated fatty acids, like avocado, nuts, or olive oil, you’ll keep saturated fat levels low. These fats don't lead to high cholesterol the same way saturated fats do. Healthful sources of fat include olive oil, fish oils, and nut-based oils, Cohen explains.
Consuming three tablespoons of EVOO isn’t enough to start shedding the kilos, Flynn says, explaining that the weight-loss effect kicks in when it’s combined with a healthy Mediterranean-style diet. This is rich in vegetables, fruit, legumes and whole grains, moderate in dairy and low in meat (about three serves of white meat or fish a week for women, and red meat only once or twice a month).