Your questions pour in from all platforms, but I answer them best in our 21-Day Metabolic Kick (21DMK) class—held twice a year. The February class was our best yet, with students transforming their metabolisms in just three weeks.

These emails come from the questions asked inside the class. If you find this email valuable, forward it to a friend who wants to learn about the authentic ketogenic lifestyle. Let’s reach more people who are ready to take control of their health!

Q: Does weight loss depend more on calories or the types of food—and how do I transition off sardines without regaining weight, especially given my metabolic fragility?

This is a common concern, especially for my patients and students like Karen who have struggled with weight loss despite strict calorie control. The answer lies not just in calories but in how food affects your insulin levels. Let’s explore the science and a practical plan to maintain your progress.

Karen’s Story: Calories Aren’t the Full Picture

Karen had reversed several health issues with her functional medicine doctor but hit a weight loss plateau despite a strict 1300-calorie diet. During our 72-hour sardine challenge, she consumed only sardines—exceeding her calorie cap but experiencing a metabolic breakthrough. Her ketones soared to over 4.0 mmol/L, and her fasting blood sugar dropped from ~100 to 88. She lost 4 pounds in a week.

But when she reintroduced yogurt (recommended for gut health), her weight loss stalled. Why? The yogurt spiked her insulin, locking fat into her cells and halting progress. This underscores a crucial truth: insulin resistance, not just calories, is the primary barrier to weight loss.

The Science: Insulin, Not Calories, Controls Fat Loss

Karen’s lifelong weight struggles suggest chronic insulin resistance. High insulin levels trap fat in adipose tissue, making it nearly impossible to lose weight—no matter how few calories you consume. True weight loss begins only when insulin is low enough to release stored fat.

Sardines are uniquely effective because they suppress insulin while raising ketones, creating the ideal conditions for fat loss. However, the goal is to maintain this metabolic state without relying solely on sardines.

How to Transition Off Sardines Without Regaining Weight

Here’s a step-by-step plan to sustain your progress:

1. Reset with Sardines (If Needed): If weight loss stalls or you regain weight, reset with 48 hours of only sardines. This suppresses insulin and reignites fat burning.
2. Monitor Your Metrics Daily: Measure morning fasting ketones and glucose. Aim for ketones above 0.8 mmol/L. These numbers reveal how your body responds to food.
3. Choose Insulin-Friendly Foods: When adding variety, prioritize foods that don’t spike insulin. For Karen, pork belly and chicken wings worked well. Avoid items like yogurt that may trigger insulin.
4. Time Your Sardines: After 3 PM, make sardines your only food. This helps maintain ketosis overnight, supporting fat loss.
5. Listen to Your Body: Your metrics will guide you. If ketones drop or glucose rises, adjust your menu accordingly.

Key Insight: “You can cut all the calories out, but when insulin stays high, you can’t open the cells storing the fat.” Managing insulin—not just calories—is the key to lasting weight loss.

The Takeaway

Weight loss depends more on the types of food that influence insulin levels than on calorie counting alone. By monitoring your ketones and glucose, you can make informed choices and sustain your progress. Sardines are a powerful tool, but with careful planning, you can transition to a varied diet without regaining weight.