Your body burns the food you eat to provide the necessary fuel. The body turns unused food into fat and stores it for later use. After 6 hours of Fasting, your blood glucose levels start to decrease. The liver then begins breaking down glycogen into glucose for energy. After 24 hours of continuous fasting, you’ve used most of your glycogen stores.
Once glycogen is gone, the body shifts to burning muscle tissue and fat for energy. It helps the body use fat for energy instead of sugar, which can support weight loss and improve insulin sensitivity. Intermittent Fasting involves alternating cycles of Fasting and eating.
Diet Psychology
You eat very little one day and return to normal eating the next day. Some people fast for 16 hours a day and consume all their calories during the remaining 8 hours. Intermittent fasting can help you lose weight more quickly and make it psychologically easier to stick to the diet.
Animal studies suggest that intermittent fasting may help animals live longer. One study found that short-term repeated fasting increased the lifespan of female mice. Fasting improves brain function by boosting the production of brain-derived neurotrophic factors (BDNF). This BDNF protein helps brain stem cells turn into new neurons. It also triggers numerous other chemicals that promote neural health.
Intermittent Fasting Health Benefits
Intermittent fasting also improves the immune system. When you fast, you reduce the free radical damage in your body. Fasting regulates inflammatory conditions in the body and starves off cancer cell formation. While Intermittent Fasting may help you lose weight, it could negatively affect your body on the biological level. Intermittent fasting may be less beneficial for women than men.
Three Methods of Intermittent Fasting
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Alternate-day fasting
It involves alternating between a 24-hour “fast day,” during which the person eats less than 25% of their usual energy needs, and a 24-hour non-fasting “feast day.” It is the strictest form of intermittent fasting because there are more days per week.
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Periodic fasting or whole-day fasting
It involves any period of consecutive fasting of more than 24 hours, ranging from the 5:2 diet, with one or two fast days per week, to more extreme versions with several days or weeks of fasting.
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Time-restricted feeding
It involves eating only for a certain number of hours each day. Common examples are missing a meal or following a 16:8 pattern, which means 16 hours of fasting and 8 hours of eating.
Studies on animals suggest that it could negatively affect female fertility. Intermittent Fasting could actually lower glucose tolerance and potentially crash women’s metabolism for someone with emotional or psychological eating disorders; intermittent fasting could amplify these issues. Skipping meals may cause cortisol levels to rise. Even small increases in cortisol can lift blood sugar levels, which may lead to more fat storage and muscle breakdown.
For a broader breakdown of how fasting compares directly with traditional eating habits, see the full analysis here:
Fasting vs 3 Meals a Day: The Hidden Truth Behind Modern Eating Habits
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