Intermittent Fasting

To study the effects of intermittent fasting on body weight, waist circumference and blood pressure.
Grade 6


Big Question:

What happens to body weight, waist circumference and blood pressure when intermittent fasting?

I chose this topic because It is Covid - 19 and most people are baking and eating non stop like my family.  I thought some grown ups would be interested in intermittent fasting and might try it out. I think it will be a bit easier for many people since you may eat what you would like for some hours too. 



I think Intermittent fasting will help:

  • lose weight
  • blood pressure go down
  • waist circumference decrease

I think Intermittent fasting will help with these 3 things because:

I think the blood pressure will go down because when you eat something your body has to work to digest it. If you don’t eat for some hours the body may be able to let blood go through easily. 

I think weight and waist circumference will decrease because usually your weight will decrease when you do not eat for some time.






What does fasting help with? 

According to Doctor Clark Gan - Heart,  Some things Fasting helps with are: 

  • Your Gut
  • Insulin sensitivity
  • The circadian rhythm
  • Physical fitness 


 What is blood pressure?

 Blood pressure  is the pressure forced by blood on the blood vessel. According to, Diastolic pressure is the pressure of the blood in the arteries when the heart is filling. Systolic pressure is the pressure of the blood in the arteries when the heart pumps. The higher number is Systolic and the lower number is Diastolic , the normal readings are 120/80.  Reasons for high blood pressure are: 

  • Age
  • Stress
  • Family history
  • Being overweight or obese 
  • Not being physically active 
  • Using tobacco 
  • Too much salt
  • Too little potassium 


 Waist circumference:

Waist Circumference is the measure around your waist. Your waist should be less than 40 inches around for men, and less than 35 inches for women. If your waist circumference is any larger than that, it could lead to:

  • Heart diseases
  • Hypertension
  • Type 2 diabetes

  And many other diseases. 

Problems with being overweight:

If you are overweight you can get diseases like:

  • Type 2 diabetes 
  • Hypertension 
  • Heart diseases 
  • Stroke 








Controlled variables: The volunteer would fast for some hours everyday

Manipulated variables: number of hours fasted 

Responding variables: change in: 

1. blood pressure 

2. weight 

3. waist circumference 



Step 1. Participant must fast for as many hours as comfortable and is only allowed water during the fasting period. 

Step 2. After fasting check blood pressure on left arm useing a blood pressure monitor, in a calm quiet place. 

Step 3. Write blood pressure reading on chart in logbook. 

Step 4. Measure waist circumference with a measuring tape at the belly botton.

Step 5. Write measurement on chart in logbook.

Step 6. Partecapent must be weighed on a bathroom scale right after using the washroom and before opening the fast. 

Step 7. Repeat for 21 days. 




Systolic blood pressure

  • Numbers lowered immediately from 140 - 125mm Hg on day 1
  • Went into to the normal range for all the days after day 2

Diastolic blood pressure

  • On the first day it lowered from 100 - 84
  • From day 2 onwards, readings kept going up and down between 74 and 90 mm Hg
  • Most readings were still above the normal range of 80 but not more than 90 mm Hg

Waist circumference 

  • Went down very slowly
  • Most days stayed the same
  • Over all went down by 2 inches


  • Stayed the same for some days then went down and then stayed for a few days again. 
  • Overall, weight decreased by 8 pounds.


  •  Blood Pressure Monitor x1
  •      Logbook x1
  •      Chart for readings x1
  •      Measuring tape x 1
  •      Body scale x1           


The Conclusion is: 

  • The Body weight went down by 8 pounds 
  • The waist circumference went down by  2 inches
  • The Systolic blood pressure came into a healthy range of 120mm Hg and below
  • The Diastolic blood pressure lowered by 10 mm Hg immediately and stayed lower than 90 mm Hg but was only on or below the normal range of 80mm Hg for 7 days. 




Intermittent fasting can be used as a tool to not only lose weight but also be healthy and fit. It can lower your blood pressure, waist circumference and weight. 


Sources Of Error

  • Day 17 forgot to take blood pressure
  • Day 20 forgot to take all readings


According to, Diastolic pressure is the pressure of the blood in the arteries when the heart is filling. Systolic pressure is the pressure of the blood in the arteries when the heart pumps.


Credits to my Mother for being my volunteer and helping me decide my topic.