Juice

Juice still contains a lot of naturally occurring sugar, while having more vitamins and minerals than honey and syrups. An eight-ounce serving of juice and cola both contain about 30 grams of sugar on average — that's almost eight teaspoons.

Juice lacks dietary fiber as well. This is a concern because fiber, which can be difficult to consume enough of on the keto diet, is essential for healthy digestion. Fiber is crucial because it slows down the movement of food through your digestive system, helping to regulate blood sugar. It's crucial to avoid consuming high-carb, low-fiber foods like juice and the resulting blood sugar spikes if you want to keep your body in ketosis. It's better to eat whole fruit instead, to get more fiber and cut down on sugar