Find out what happens to your body when you try the anti-ageing diet for 90 days.
In a world that relentlessly pursues the fountain of youth, the Fasting Mimicking Diet has emerged as a tantalizing prospect, offering the potential to reverse biological age by an average of 2 and 1/2 years in just 90 days. Brendan Jones, an adventurous and health-conscious individual, undertook the challenge of this novel dietary approach and documented his experiences, providing a unique glimpse into the promises and pitfalls of this cutting-edge anti-ageing trend.
The Goal Guys are two brothers (Brendan and Cam Jones) with a YouTube channel with more than 400,000 subscribers. They share videos in which they take on “different goals in fitness and productivity.”
The allure of the Fast Mimicking Diet lies in its distinctive characteristics—it boasts being the lowest-calorie meal plan Brendan had ever tried, with just under 1,000 calories consumed each day during the five consecutive fasting days each month. This intriguing regimen allows individuals to restrict their caloric intake drastically while providing a respite with a return to a normal diet for the rest of the month.
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As Brendan delved into this transformative journey, the prospect of reversing biological age fuelled his curiosity and determination. The Fast Mimicking Diet has rapidly gained attention in the realm of anti-ageing, with early studies suggesting remarkable results. Brendan’s decision to undergo blood work before and after the 90-day period aimed to objectively measure the diet’s impact on his biological age, adding a scientific dimension to his personal exploration.
This article chronicles Brendan’s experiences with the Fast Mimicking Diet, delving into the specifics of his dietary adjustments, the challenges encountered, and the unexpected outcomes. It provides a comprehensive overview of his journey, offering readers valuable insights into the practical aspects of adopting such a diet and raising critical questions about the sustainability and universality of this approach.
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As Brendan navigates the uncharted territory of extreme caloric restriction and plant-based eating, the reader is invited to consider the implications of such dietary trends on overall health, well-being, and the pursuit of longevity. The Fast Mimicking Diet, though promising, presents a nuanced landscape that requires careful examination, and Brendan’s firsthand account becomes a lens through which readers can explore the broader conversation about ageing, nutrition, and lifestyle choices.
What Happens to Your Body When You Try the Anti-Ageing Diet for 90 Days?
The Fast Mimicking Diet Basics:
Brendan embarked on this transformative journey with the lowest-calorie meal plan he had ever tried, restricting his calories to just under 1,000 each day for five consecutive days each month. The grand total of 4,500 calories for the programmed 5 days allowed him to resume his normal diet for the rest of the time.
The Experiment:
To determine the efficacy of the Fast Mimicking Diet, Brendan underwent blood work to establish his current biological age before starting the plan. The initial results revealed a remarkable 2.7 years younger biological age, sparking excitement and motivation for the journey ahead – the test showed 30.5 years.
The Dietary Challenge:
The Fast Mimicking Diet imposed not only a significant caloric restriction but also required a plant-based diet, bidding farewell to indulgences like chicken breast. Brendan detailed his meal plan, consisting of protein-packed overnight oats, a super veggie lunch, and a cauliflower stir fry for dinner during the fasting days.

Concerns and Adjustments:
Worried about potential muscle loss, Brendan incorporated strength training and limited cardio during the fasting days. However, after an unexpectedly rapid weight loss of 7 pounds in the first four days, he realized he had been misinterpreting the diet’s nutritional requirements.
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Professional Guidance:
Acknowledging his errors, Brendan sought advice from sports nutritionist Christina Suter, who emphasized the importance of following the Fast Mimicking Diet’s specific macronutrient ratios. Adjusting his approach, Brendan subscribed to a meal kit designed to meet the diet’s nutritional targets.
Challenges and Setbacks:
As Brendan progressed through the weeks, challenges arose. Energy crashes, concentration issues, and a decline in sleep quality were notable obstacles. Despite these setbacks, Brendan pushed through, relying on determination and adjustments to his routine.
The Results:
After 90 days of dedication, Brendan eagerly awaited the final blood test results. To his disappointment, his biological age had jumped from 30.5 to 32.9. Analyzing the data, Brendan discovered improvements in metabolism, cognition, and gut health but identified a sharp decline in sleep and recovery scores.

Brendan Jones’ journey with the Fast Mimicking Diet provided not only a unique experiment but also valuable insights into the pursuit of longevity and well-being. While the initial excitement surrounded the possibility of reversing biological age, the conclusion of the 90-day challenge led Brendan to reflect on the broader aspects of a healthy lifestyle.
The unexpected jump in biological age during the final blood test underscored the complexity of individual responses to dietary interventions. Brendan’s improvements in metabolism, cognition, and gut health suggested that aspects of the diet were beneficial, but the overall impact on his well-being was not as anticipated.
In conclusion, Brendan’s journey serves as a reminder that sustainable health practices, supported by scientific evidence, remain crucial for long-term well-being. Instead of solely relying on the latest trends, individuals may find more success and satisfaction in adopting a holistic and consistent approach to exercise, nutrition, and sleep. Brendan’s transparency about his experience contributes valuable information to the ongoing dialogue about the effectiveness and potential limitations of emerging health trends. Ultimately, his experience reinforces the idea that a balanced and proven lifestyle is the foundation for a healthy and fulfilling life.
If you want to see the changes he noticed, simply watch Brendan’s video below.
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Diet is often considered the most important ingredient in transforming your body because it plays a central role in both weight loss and overall health. Here are key reasons why diet holds such significance in body transformation:
- Caloric Balance: Body transformation, particularly weight loss or muscle gain, is fundamentally linked to caloric balance. Consuming fewer calories than your body expends creates a caloric deficit, leading to weight loss. Conversely, a caloric surplus supports muscle growth. Diet directly influences this balance, making it a crucial factor in shaping your body composition.
- Nutrient Intake: The quality of the food you consume impacts your overall health and body composition. A well-balanced diet provides essential nutrients like vitamins, minerals, proteins, fats, and carbohydrates. These nutrients are vital for energy production, muscle development, metabolic function, and overall well-being. Proper nutrition supports muscle preservation during weight loss, enhances exercise performance, and facilitates recovery after workouts.
- Hormonal Regulation: Diet influences hormonal responses in the body, including those related to metabolism, appetite, and fat storage. For example, a diet high in refined sugars can lead to insulin spikes, promoting fat storage. On the other hand, a diet rich in protein and fiber helps regulate blood sugar levels, contributing to stable energy and reduced cravings.
- Sustainable Lifestyle Changes: Unlike short-term exercise routines, diet represents a daily habit that significantly impacts your body over time. Developing sustainable eating habits allows for long-term adherence to a healthy lifestyle, supporting consistent progress in body transformation goals.
- Weight Loss vs. Muscle Gain: While exercise, especially strength training, is crucial for building and maintaining muscle mass, diet plays a primary role in achieving a caloric deficit for weight loss or a surplus for muscle gain. Achieving the right balance through diet ensures that your body is primed for the specific transformation goal you have in mind.
- Personalization: Every individual’s body responds differently to various foods, and dietary needs can vary based on factors like age, gender, activity level, and metabolism. Tailoring your diet to meet your specific requirements ensures a personalized approach to body transformation, optimizing results.
In essence, diet serves as the cornerstone of body transformation due to its direct impact on caloric balance, nutrient intake, hormonal regulation, and the sustainability of lifestyle changes. While exercise is a crucial complement, the saying “you are what you eat” holds true when it comes to achieving lasting and impactful changes in your body composition and overall health.
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