While cutting down your carb intake all at once may result in faster weight loss, the simple fact is you’re not going to lose any weight unless you stick to that low carb or Keto diet. So, your first priority should be to ensure you’re not going to give up on the diet because you feel too crappy. If that’s going to be the case, then try reducing your carb intake slowly.
Fairly recently, the diet was introduced as a weight-loss diet by an Italian professor of surgery, Dr. Gianfranco Cappello of Sapienza University in Rome. In his 2012 study, about 19,000 dieters received a high-fat liquid diet via a feeding tube inserted down the nose. The study showed an average weight loss of more than 20 pounds in participants, most of whom kept it off for at least a year. The researchers reported a few minor side effects, like fatigue.

In many developing countries, the ketogenic diet is expensive because dairy fats and meat are more expensive than grain, fruit and vegetables. The modified Atkins diet has been proposed as a lower-cost alternative for those countries; the slightly more expensive food bill can be offset by a reduction in pharmaceutical costs if the diet is successful. The modified Atkins diet is less complex to explain and prepare and requires less support from a dietitian.[55]
"One of the primary places where you are going to see metabolic changes on any kind of diet is in your gastrointestinal tract -- and that can include a change in bowel habits often experienced as constipation," says Sondike, who is also credited with conducting the first published, randomized clinical trial on low-carb diets. The reason, Sondike tells WebMD, is that most folks get whatever fiber they consume from high-carb foods such as bread and pasta. Cut those foods out, and your fiber intake can drop dramatically, while the risk of constipation rises.

Increasing your sodium intake. This will help counteract the water loss that happens when starting a keto diet and replenish sodium. Salt your food heavily; you don’t have to worry about it increasing your blood pressure, because when you’re on a low-carb diet, your insulin stays stable and low, which sends a signal for your kidneys to continuously excrete sodium[*]. 

"You can find a lot of "fat bomb" recipes on the Internet," Wittrock says. "These are very good at satisfying your sweet tooth, and are a great way to increase fat consumption without going over on protein. Also, I'm a huge fan of salted pumpkin seeds and salted sunflower seed kernels. Believe it or not, pork rinds are also a very good keto snack."
Many people take MCT oil and exogenous ketones when they start a Keto diet in order to boost their ketone levels. However, if you’re unused to taking these Keto supplements, then they can cause you to have the runs pretty badly. So make sure to start with a small amount at first (a few grams of ketone salts per day OR 1/2 teaspoon of MCT oil). And then gradually increase your intake as your stomach adjusts to it.

When you eat less than 50 grams of carbs a day, your body eventually runs out of fuel (blood sugar) it can use quickly. This typically takes 3 to 4 days. Then you’ll start to break down protein and fat for energy, which can make you lose weight. This is called ketosis. It's important to note that the ketogenic diet is a short term diet that's focussed on weight loss rather than the pursuit of health benefits. 
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