I do 16/8 or 18/6 IF most of the time. Technically to remain in a fasted state and to take full advantage of autophagy and apoptosis, you should keep your calories at zero. So, drink your coffee black. You should avoid artificial sweeteners also, because studies have shown that the mere taste of something sweet spurs the body to release insulin. Insulin is one of two hormones (the other being cortisol) that causes your body to store fat. If your body is in fat storage mode, it can't simultaneously be in fat burning mode. So you want to keep your insulin very low during your fasts. If you feel weak and must have some calories, go with heavy cream in your coffee or another full-fat, zero carb, zero protein "snack". It will at least keep you in ketosis and burning fat.
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