Today, this natural physiological mechanism has been exploited by a number of low-carb diet regimes. The aim of ketogenic diets is to send the body into a state of 'ketosis' by using a very strict low-carb diet. This umbrella term can include diets such as the Atkins diet, Dukan diet and LCHF diets such as the banting diet, although the ratios of fat, protein and carbs and other specific features of each diet (eg 'phases') can vary.
For coffee and tea, replace milk with cream in reasonable amounts. You may have a small amount of raw milk but be aware of the extra carbs. Lastly, farmers in the United States use genetically engineered bovine growth hormone.