However, for some people it can take a week or longer to achieve ketosis depending on age, metabolism, physical activity level and prior diet. Conversely, complex carbs such as fiber and starches take longer to break down resulting in feeling fuller longer. Pure spirits take the cake here (figuratively, of course) because they contain zero carbs. Mixing your keto approved spirits with straight water or seltzer is perfectly acceptable on keto, but tonic water (which is a bitter soda made from…