07/02/2026
We have just finished a 92‑hour fast. Going in, I wasn’t at my best metabolically, and on day two my blood glucose dropped to around 3 mmol/L. I felt shaky for a few hours. Normally black coffee stabilises me, but this time it didn’t touch it. What did help, unexpectedly, was a BHB ketone drink. Within a short window I felt normal again, which lines up with current research showing exogenous ketones can temporarily support brain energy when glucose availability dips, despite ongoing debate in both mainstream science and more confrontational fasting communities about whether they “break” a fast. Functionally, they worked.
Alison had a very different experience. She leaned fully into the fast and actually felt the benefits compound as the days went on. Energy stayed stable, mental clarity improved, and despite fasting she trained every evening without issue. Her workouts felt cleaner and more efficient, which lines up with what we see in metabolically flexible individuals who can switch smoothly between glucose and fat‑ketone use. As glycogen dropped, fat oxidation and ketone availability picked up the slack, supporting endurance, recovery, and focus rather than limiting performance. Instead of the fast feeling like a stressor, it became a performance tool, highlighting how fasting, when matched to the right physiology and training load, can actively support consistent workouts rather than hinder them.
We broke the fast Saturday morning with scrambled eggs and avocado. Eggs provided complete protein, choline, B vitamins, and fat-soluble vitamins, while avocado added potassium, magnesium, fibre, and monounsaturated fats to gently reintroduce digestion and stabilise insulin.
Honestly, after four days without food, it tasted Michelin‑level.
Our second meal was Hunter and Gather beef protein powder,
first time using it. Ingredient-wise it’s straightforward:
100 percent beef protein with a full spectrum of 20 amino acids.
That includes leucine at 860 mg per serving for muscle protein synthesis, isoleucine and valine for muscular energy and recovery,
lysine for collagen and immune support, and a very high glycine content at around 4.5 g, which is particularly relevant after fasting as glycine supports connective tissue repair, sleep quality, and nervous system balance.
Proline and hydroxyproline underpin tendons, ligaments, cartilage, and skin, while glutamic acid supports gut lining integrity and neurotransmitter function.
Carbohydrate content is negligible at around 0.2 g per serving, with virtually no sugar, making it compatible with low‑carb and ketogenic refeeding strategies.
Micronutrient-wise, beef protein naturally contributes small amounts of iron, zinc, and sodium, which can be useful after prolonged fasting.
I mixed it with full‑fat Greek yoghurt, frozen blueberries, Brazil nuts, pumpkin seeds, and walnuts. Together, this combination makes nutritional sense.
Greek yoghurt adds calcium, probiotics, and additional leucine.
Blueberries contribute polyphenols and vitamin C, supporting oxidative stress management after a fast,
with modest carbohydrates to reintroduce glucose gently.
Brazil nuts provide selenium for thyroid and antioxidant enzyme function.
Pumpkin seeds add magnesium, zinc, and some slow‑digesting carbs,
while walnuts bring omega‑3 fatty acids and additional polyphenols for cardiovascular and brain health.
As a second meal after a prolonged fast, it was surprisingly balanced: protein for repair, fats for satiety, fibre and polyphenols for gut signalling, minimal sugar, and a controlled carbohydrate load. It tasted incredible, but beyond that, it felt like the body recognised the food and knew what to do with it.