Fasting has been gaining popularity in recent years for its potential health benefits, including weight loss, improved digestion, and even increased longevity. 

However, fasting is not for everyone and can have potential negative effects on certain individuals, especially if done improperly or for too long. 

If you have tried fasting but experienced weakness, fatigue, dizziness, nausea, worsening of PMS, and continued weight gain, this could be due to not having a digestion type that benefits from fasting.

For example:
Fasting for a digestion type that shouldn’t fast can potentially lead to weight gain in the long term. When the body is deprived of food for an extended period, it goes into a state of survival mode, and the metabolism slows down to conserve energy. This can result in a slower metabolism and the body holding onto fat stores for energy, leading to weight gain.

Let’s explore the pros and cons of fasting and which digestion types should consider fasting and which should avoid it.


  1. Weight Loss: Fasting can help reduce calorie intake, leading to weight loss. By reducing calories, the body is forced to burn stored fat for energy, leading to a reduction in body fat.
  2. Improved Gut Health: Fasting can give the digestive system a break and reduce inflammation, leading to improved digestion and gut health.
  3. Lower Blood Sugar and Insulin: Fasting can help lower blood sugar and insulin levels, leading to improved insulin sensitivity and reduced risk of type 2 diabetes.
  4. Increased Longevity: Studies have shown that fasting can increase longevity by reducing oxidative stress, improving metabolic health, and reducing the development of chronic diseases.
  5. Autophagy: Fasting can trigger a process called autophagy, which is the body’s natural process of cleaning out damaged cells and regenerating new ones.


  1. Nutrient Deficiencies: Fasting can lead to nutrient deficiencies, especially if done for long periods. It’s important to ensure that the body is getting enough essential nutrients during a fast, either through food or supplements.
  2. Increased Hunger: Fasting can increase hunger and lead to overeating during non-fasting periods, potentially leading to weight gain.
  3. Muscle Loss: Fasting can lead to muscle loss, especially if done for long periods. The body may use muscle tissue for energy if it’s not getting enough from food.
  4. Hormonal Imbalances: Fasting can lead to hormonal imbalances, especially if you have a certain digestion type. Hormonal imbalances can cause fatigue, mood swings, and other negative symptoms.


Short-term fast is generally defined as a period of time when you consume little or no food, typically for a period of up to 24 hours. 

Intermittent fasting involves periods of food restriction or calorie reduction, and can also be considered a form of short-term fasting. For example, eat within an 8 hour window, fast for 16 hours.

Long-term fasting typically involves periods of food restriction that last longer than 24 hours, often for several days or weeks. Long-term fasting may also involve consuming only certain types of foods, such as juices or broths, and avoiding solid foods altogether.

The duration of a fast can have a significant impact on how the body responds and adapts to the absence of food. Short-term fasts can offer several benefits, such as improved: 

  • Insulin sensitivity
  • Weight loss
  • Reduced inflammation

Long-term fasting, however, can come with risks and may not be suitable for everyone.

It’s important to note that fasting, whether short-term or long-term, can be challenging both physically and mentally. 

Not all digestion types get benefits from fasting. Let’s look at which type can fast, and which type should not fast.


  • Consecutive: You may be able to handle short-term fasts of up to 24 hours, as your digestive system is designed to process food quickly and efficiently.
  • Alternating: You can also handle short-term or intermittent fasts. You may find it challenging to fast for long periods, as your digestion relies on a consistent routine.
  • Hot: You may benefit from occasional short-term fasting, as it can help cool the body and reduce inflammation.
  • Calm: You may be able to handle short-term fasts, but may struggle with extended periods of restriction or deprivation. Consistent and gentle nourishment may be more beneficial for you.
  • High: You may benefit from occasional fasting, as it can help to balance excess energy and provide a sense of grounding.
  • Direct: You may be able to handle short-term fasts, as you are designed to quickly process and eliminate waste. However, extended periods of fasting may disrupt your digestion and cause imbalances.


  • Open: You may struggle with fasting, as your digestion is more sensitive and may require regular nourishment to function properly. Fasting may lead to imbalances and digestive discomfort.
  • Cold: You may not respond well to fasting, as it can further slow down your already sluggish digestion. Regular meals and warming foods may be more beneficial for you.
  • Nervous: You may find fasting stressful and anxiety-inducing, which can exacerbate digestive issues. A consistent and calming routine may be more beneficial for you.
  • Low: You may struggle with fasting, as it can deplete your already low energy levels. Consistent nourishment and gentle movement may be more beneficial for you.
  • Indirect: You may struggle with fasting, as your digestion requires a consistent routine and gentle nourishment.

In conclusion, fasting has its pros and cons. While it can be an effective way to lose weight and improve gut health, it may not be suitable for everyone, particularly those with certain digestion types.

It’s important to consult with a medical or functional medicine practitioner before embarking on a fasting regimen to ensure it’s safe and appropriate for your individual needs. If you are looking to learn more about your digestion type and if fasting is right for you, schedule a Human Design Health Analysis.