BV #17: Weight Regain On Sugar Diet & Metformin + Sugar Fasting = Disaster

Aug 19, 2025

Explore the challenges of the sugar diet and the surprising risks of using Metformin. The hosts dive into the complexities of insulin sensitivity and the potential drawbacks of Jardiance and retatrutide. Real-life stories reveal why weight often rebounds after the sugar diet. They also discuss how low-fat eating can heighten anxiety and disrupt hormones. Finally, they emphasize the importance of sustainable, health-first weight loss strategies instead of extreme measures.

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INSIGHT

Metformin's Metabolic Trade-Off

Metformin lowers blood glucose but works partly by inhibiting mitochondrial complex I and shifting glucose to lactate.
That creates inefficient ATP production, more ROS, and a false appearance of improved insulin sensitivity.

INSIGHT

Carb-Focused Diets Clash With Complex I Blockers

Carbohydrate oxidation delivers more NADH to complex I, so blocking complex I (metformin) conflicts with a high-carb strategy.
Mike Fave warns this mismatch forces glycolysis and lactic acid, undermining cellular energy use.

INSIGHT

FGF21 Raises Metabolism Via Stress

FGF21 raises energy expenditure by activating stress (SNS and HPA), not by increasing constructive cellular ATP.
That stress-driven increase can be wasteful and harmful long-term compared to optimizing mitochondrial energy production.

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In this episode we discuss:

Jay Campbell, Hunter Williams, and Mark Bell’s supplement stacks for staying insulin sensitive on the sugar diet
Whether using Metformin while on the sugar diet helps improve insulin sensitivity
The major differences between the sugar diet and the bioenergetic approach
Real-life examples of weight regain and other negative experiences after the sugar diet

Free Energy Balance Food Guide: https://jayfeldmanwellness.com/guide

The Nutrition Blueprint: https://mikefave.com/the-nutrition-blueprint/

Theresa's Instagram: https://www.instagram.com/livingrootswellness/

Timestamps:

0:00 – intro

0:24 – the costs of metformin: mitochondrial toxicity, increased lactate, inefficient ATP production, and slowed metabolism

5:22 – is using Metformin a good idea on the sugar diet?

10:30 – the dangers of increasing FGF21 while on Metformin

13:53 – increasing FGF21 activity is counter to the bioenergetic view of health

20:23 – Hunter Williams’ supplement stack for insulin sensitivity: metformin, Jardiance, retatrutide, and dihydroberberine

21:42 – the negative effects of Jardiance

24:59 – whether retatrutide and other GLP-1 agonists are healthy from a bioenergetic perspective

27:30 – whether there are any benefits to using medications like metformin, Jardiance, retatrutide, and dihydroberberine

31:54 – how increasing FGF21 with the sugar diet could lead to heart problems such as arrhythmias and atrial fibrillation (AFIB)

38:58 – does the sugar diet boost metabolic rate the same way the bioenergetic approach does?

46:27 – examples of how the sugar diet downregulates metabolism through stress

50:51 – the cumulative effects of stress: how much stress can we handle?

55:15 – how to recover from the negative effects of the sugar diet

58:24 – is stress beneficial? is it possible to avoid stress altogether?

59:51 – problems with dropping fat too low, especially in lean individuals

1:03:50 – the risks of rapid weight loss and the importance of keeping long-term goals in mind

1:08:02 – why cutting out entire macronutrient groups can backfire and what to do instead

1:11:20 – how extreme diets prime our bodies for weight regain

1:14:54 – real-life examples of weight regain after the sugar diet and why it happens

1:20:18 – is there a smarter way to do the sugar diet?

1:24:01 – are there legitimate benefits to the sugar diet?