Stock up on Sardines now BEFORE IT’S TOO LATE
![Dr. Boz [Annette Bosworth, MD]](https://yt3.ggpht.com/wmxkT94LN1N2ujFLA7_YMlEgwZG_rqBnqbjh6BAjMU4gOD-oNLizrcDRL-9WuOoWlzs0_dMyfQ=s88-c-k-c0x00ffffff-no-rj)
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The Sardine Challenge: Origins, Metabolic Impact, and Debunking Myths
Discover why a three-day sardine-only fast can drastically improve metabolic markers like glucose and ketones, and learn how this simple food challenges long-held conventional dietary advice.
Short Summary
- Implemented a 72-hour sardine challenge resulting in immediate, measurable metabolic improvements across groups of patients.
- The practice was originated by Dr. Dom Diagastino in 2015 as an emergency ketogenic "bailout" strategy for times of high stress.
- Data suggests the sardine fast produces superior metabolic results compared to a pure water fast, potentially promoting mitochondrial replacement.
- Provides direct rebuttals to common criticisms regarding fiber necessity, electrolyte risk, and heavy metal contamination in sardines.
This session details the evolution of the sardine protocol, from an anecdotal tip shared by Dom Diagastino to a structured, data-backed component of Dr. Boz's 21-Day Metabolic Kick. You will gain insight into why this nutrient-dense, ultra-low-carb protocol acts as a powerful tool for rapidly improving insulin sensitivity and overall cellular health.
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Top Comments (10)
My 1st can of sardines was 8 months ago (I'm 51 yrs old 🤣). I heated them up, DO NOT DO THIS‼️ 🙅🏾♀️🤢. I usually have them like tuna salad (boiled egg, a little mayo and mustard) 5 days a week then 2 day water fast. Started at 232 lbs now at 167 lbs. GKI has been 2.9 for 2 months 💃🏾💃🏾💃🏾
I JUST FOUND OUT ABOUT YOU ON THE DIARY OF A CEO: MY FAVORITE GUY🙌🏽🙌🏽☀️. I’m on day 3 of the Sardines Diet to get my Ketones back on track! Two types of Sardines, 6 cans a day of the most delicious sardines, 1. Extra Virgin Olive Oil, Wild Pacific, Cleaned, Scale Free, Lightly Smoked & 2. Skinless/Boneless 100% Olive Oil Wild Caught & Sustainable. I feel GREAT, NOT RAVENOUS, NOT SUGAR CRAVED, CLEAR MIND😊😊 After losing 44lbs since May 2025 after medical emergency (intense migraines, tinnitus, vertigo, nausea) & the Steroids that ballooned my body, I had to regroup. Keto saved me! My bday in Nov. & the cake called my name YIKES, I celebrated me then I ate candy, then I drank juice over a 4 day period. I felt repulsed & a little sick, but the SARDINES BROUGHT ME BACK TO MY LEVEL HEADED BEST!!! Thank you so much… I’ve purchased your book. I’m a fan👍🏽. 30 more lbs & I’ll reach my sustainable goal. Any advice⁉️.
Sardines have always been my quick, "go to" protein when I need something healthy and filling but I don't have time to cook.
I started 2026 eating only sardines, not only to lose weight, but to improve my 50 year old metabolism. It was easy the first 4 days, then it got tirying. I did not detour. I added avocado one day, made lettuce tacos another with lots of serrano chile. I dd greek yogurt and spice next. I aspire to last 15 days. My goal is to reboot my metabolic health. Thanks Doc. I feel great so far.
I have a friend whose family survived the Second World War by eating sardines. He said at times all they had was half a sardine each per day.
Mixing a mashed avocado with a can of sardines, sprinkled with salt and a twist of lemon was a game changer for me.
I think one can start eating sardines in a crunchy romaine lettuce with some mustard n chopped onion
DoctorBoz, I am on 48 hours of sardines only. Going for the 72 hours. Tested my Ketones yesterday about 12 hours in and it was 0.2. Today I woke up ran for 35 minutes and felt amazing. Looking to measure my ketones tomorrow morning to compare. I’ll push to 72 hours or until my ketones gets up to 2.0. I’ve done water only fasting for 96 hours before, and it was much, much harder than eating the sardines.
I Get Sardines in water .Sqeeze fresh lemon ,Extra Virgin Olive oil Ground black pepper and Salt if you want. Also tried it with ACV .
At 90 I completed the 3 day sardine fast last week and lost 4 pounds. Tasty and satiating I’m sold on the approach to weight loss. I have decided that I will incorporate a sardine only day each week and see if I can continue to hold my weight down. I am healthy and active, but think the sardines are a healthy addition to my lifestyle.
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Top Comments (10)
My 1st can of sardines was 8 months ago (I'm 51 yrs old 🤣). I heated them up, DO NOT DO THIS‼️ 🙅🏾♀️🤢. I usually have them like tuna salad (boiled egg, a little mayo and mustard) 5 days a week then 2 day water fast. Started at 232 lbs now at 167 lbs. GKI has been 2.9 for 2 months 💃🏾💃🏾💃🏾
I JUST FOUND OUT ABOUT YOU ON THE DIARY OF A CEO: MY FAVORITE GUY🙌🏽🙌🏽☀️. I’m on day 3 of the Sardines Diet to get my Ketones back on track! Two types of Sardines, 6 cans a day of the most delicious sardines, 1. Extra Virgin Olive Oil, Wild Pacific, Cleaned, Scale Free, Lightly Smoked & 2. Skinless/Boneless 100% Olive Oil Wild Caught & Sustainable. I feel GREAT, NOT RAVENOUS, NOT SUGAR CRAVED, CLEAR MIND😊😊 After losing 44lbs since May 2025 after medical emergency (intense migraines, tinnitus, vertigo, nausea) & the Steroids that ballooned my body, I had to regroup. Keto saved me! My bday in Nov. & the cake called my name YIKES, I celebrated me then I ate candy, then I drank juice over a 4 day period. I felt repulsed & a little sick, but the SARDINES BROUGHT ME BACK TO MY LEVEL HEADED BEST!!! Thank you so much… I’ve purchased your book. I’m a fan👍🏽. 30 more lbs & I’ll reach my sustainable goal. Any advice⁉️.
Sardines have always been my quick, "go to" protein when I need something healthy and filling but I don't have time to cook.
I started 2026 eating only sardines, not only to lose weight, but to improve my 50 year old metabolism. It was easy the first 4 days, then it got tirying. I did not detour. I added avocado one day, made lettuce tacos another with lots of serrano chile. I dd greek yogurt and spice next. I aspire to last 15 days. My goal is to reboot my metabolic health. Thanks Doc. I feel great so far.
I have a friend whose family survived the Second World War by eating sardines. He said at times all they had was half a sardine each per day.
Mixing a mashed avocado with a can of sardines, sprinkled with salt and a twist of lemon was a game changer for me.
I think one can start eating sardines in a crunchy romaine lettuce with some mustard n chopped onion
DoctorBoz, I am on 48 hours of sardines only. Going for the 72 hours. Tested my Ketones yesterday about 12 hours in and it was 0.2. Today I woke up ran for 35 minutes and felt amazing. Looking to measure my ketones tomorrow morning to compare. I’ll push to 72 hours or until my ketones gets up to 2.0. I’ve done water only fasting for 96 hours before, and it was much, much harder than eating the sardines.
I Get Sardines in water .Sqeeze fresh lemon ,Extra Virgin Olive oil Ground black pepper and Salt if you want. Also tried it with ACV .
At 90 I completed the 3 day sardine fast last week and lost 4 pounds. Tasty and satiating I’m sold on the approach to weight loss. I have decided that I will incorporate a sardine only day each week and see if I can continue to hold my weight down. I am healthy and active, but think the sardines are a healthy addition to my lifestyle.