Keto Fire Nonetheless others simplest require you to reduce calories with out disposing of meals is fasting safe? For the general public fasting for a quick time frame may be safe to do. However in case you are considering fasting lengthy periods of time extra than 5 days may be harmful. The purpose for this is that your frame needs sure nutrients, minerals, and different nutrients from meals to stay healthful. The absence of those vitamins for a long period of time can motive fatigue, dehydration, dizziness and possible loss of life.