Those issues can be part of what's known as the “keto flu,” Warren says. Other side effects of the keto diet, all of which are tied to carb withdrawal, can include lightheadedness, nausea, mental fog, cramps, and headaches, in addition to tiredness. Luckily, the keto flu doesn't usually last more than a week—which is coincidentally about when people start to see the number on the scale go down, says Warren.

You will need to cut out ALL sugar. Sugar substitutes are also a no-no. It will be a few tough days to adjust from all the sugar you have been consuming, you will not feel good at all! Look up keto flu, you will most likely suffer from this about a week into the diet. As for snacks, I have stuck to a few almonds, pepperoni sticks, cheese sticks ( cheese can kick you out of ketosis so be careful) pickles, and broth, cucumber slices. If you are in ketosis your appetite will diminish and your need for snacking will lessen. I also do intermittent fasting, no food after 8PM or before 12:00PM the next day, 16 hours without food, I will have bulletproof coffee in the morning, tea with milk and broth between these hours.
A keto diet has shown to improve triglyceride levels and cholesterol levels most associated with arterial buildup. More specifically low-carb, high-fat diets show a dramatic increase in HDL and decrease in LDL particle concentration compared to low-fat diets.3A study in the long-term effects of a ketogenic diet shows a significant reduction in cholesterol levels, body weight, and blood glucose. Read more on keto and cholesterol >
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