In a compelling episode of the Huberman Lab Podcast, Dr. Andrew Huberman sat down with Dr. Michael Snyder, a professor of genetics at Stanford University, to tackle a growing question in health and nutrition:
Why do people respond so differently to the same foods, supplements, or lifestyle habits?
As it turns out, everything from your genes to your gut bacteria might influence how your body handles a slice of bread or a bowl of oatmeal — and understanding this can change the way we approach fitness, healthspan, and longevity.
Jump to:
- Everyone’s Glucose Response Is Unique — Here’s Why It Matters
- CGMs Are Changing the Game
- Feeling Sleepy After Eating? It’s Not Just the Turkey
- Simple Tools to Flatten the Glucose Curve
- Not All Diabetes Is the Same
- Timing Your Meals and Exercise Can Boost Glucose Control
- Gut Microbiome: The Hidden Variable
- GLP-1 Agonists: More Than Just Weight Loss?
- Bottom Line: One-Size-Fits-All Health Advice Doesn’t Work
Everyone’s Glucose Response Is Unique — Here’s Why It Matters
One of the most eye-opening revelations from Dr. Snyder’s lab is that blood sugar spikes vary dramatically from person to person, even when they eat the same food. In one study, people were classified as “potato spikers” or “grape spikers” based on which food caused a larger insulin response. These findings emphasize that standard glycemic index charts may be irrelevant for many individuals, because your personal biology trumps the average data.
For instance, one person may see a sharp glucose spike from eating white rice, while another remains stable. Even “healthy” foods like oatmeal can make some individuals feel sluggish or foggy — a sign that something deeper is going on than just calorie count.
“Turns out it depends on which genes and which proteins you make,” said Dr. Snyder. “In other words, individual variability matters.”
CGMs Are Changing the Game
Dr. Snyder’s team uses continuous glucose monitors (CGMs) to track real-time blood sugar levels, offering insights beyond what hemoglobin A1C or occasional finger-stick tests can provide.
CGMs revealed that:
- Some “healthy” people spike just as high as diabetics and don’t even know it.
- Others maintain nearly flat glucose levels regardless of diet.
- Time in glucose range (70–140 mg/dL for non-diabetics) strongly correlates with long-term health outcomes.
This technology empowers users to identify which foods, behaviors, and even exercise timings affect their glucose control — and therefore their metabolic health and longevity.
Feeling Sleepy After Eating? It’s Not Just the Turkey
That post-meal fatigue many associate with heavy meals like Thanksgiving dinner might be your body reacting to a glucose crash after a spike. Huberman described feeling extreme fatigue after oatmeal, but not after eating white rice. Dr. Snyder confirmed that feeling sleepy or mentally foggy after eating can be a red flag for glucose dysregulation.
This isn’t just about feeling tired — prolonged or repeated spikes in blood sugar are linked to cardiovascular disease, inflammation, and early mortality.
Simple Tools to Flatten the Glucose Curve
If you’re noticing energy crashes or brain fog after meals, there are some surprisingly simple things you can do:
1. Brisk Walks After Eating
- Just 15–20 minutes of walking can dramatically reduce blood sugar spikes.
- Even a short walk after a high-carb meal like white rice can blunt the glucose response.
2. “Soleus Pushups” or Seated Calf Raises
- A recent study found that repeatedly lifting your heels while seated (engaging the soleus muscle) acts like a glucose sponge.
- This is useful when walking isn’t feasible — such as during a long meeting or a flight.
3. Exercise “Snacks”
- Regular movement breaks throughout the day — squats, pacing, even toe taps — can help keep your metabolism humming.
- Particularly important for people with sedentary jobs.
Not All Diabetes Is the Same
Dr. Snyder emphasized the importance of understanding your glucose dysregulation subtype. Type 2 diabetes isn’t one-size-fits-all. There are at least three key subtypes:
- Muscle insulin resistance: Muscles don’t absorb glucose well.
- Beta cell defects: The pancreas doesn’t release insulin effectively.
- Incretin dysfunction: The hormonal signals that stimulate insulin are impaired.
Knowing your subtype is crucial. For example:
- Resistance training helps people with muscle insulin resistance but not those with beta cell defects.
- People with beta cell issues may respond better to certain medications like repaglinide.
- GLP-1 agonists like Ozempic work well for incretin issues — and Snyder himself saw a dramatic improvement in his A1C using these drugs, even without weight loss.
Timing Your Meals and Exercise Can Boost Glucose Control
Emerging evidence from Snyder’s lab suggests that meal timing affects glucose control just as much as what you eat:
- Eating a larger meal earlier in the day results in better blood sugar regulation.
- Late-night eating, especially if it’s carb-heavy, tends to worsen glucose control and sleep quality.
- A post-dinner walk and avoiding snacks before bed can lead to better next-day glucose levels.
On the exercise front:
- People with muscle insulin resistance benefit more from morning workouts, particularly resistance training.
- Those with other types of dysregulation might need personalized routines based on their subtype.
Gut Microbiome: The Hidden Variable
One of the most fascinating parts of the conversation was the role of the gut microbiome in shaping glucose responses. Dr. Snyder shared research where people drank the same meal replacement shake, yet had radically different inflammatory and blood sugar responses.
- The microbiome is largely shaped in the first three years of life, but can still be influenced by diet, fiber intake, and lifestyle.
- People in native or non-industrialized societies have 3x more microbial diversity — which likely contributes to better metabolic flexibility and reduced chronic disease rates.
GLP-1 Agonists: More Than Just Weight Loss?
GLP-1 drugs like Ozempic and Mounjaro aren’t just for diabetics anymore — they’re being explored for longevity, cognitive benefits, and even addiction reduction.
Dr. Snyder, who takes these drugs for his beta cell defect, experienced significant improvements in glucose control and a notable drop in body fat, especially visceral fat (the most dangerous kind). However, he emphasizes that muscle maintenance is critical — and daily resistance training helped him retain muscle during rapid fat loss.
“It’s not just about taking a drug. You can do a lot with just lifestyle,” he said.
Bottom Line: One-Size-Fits-All Health Advice Doesn’t Work
This deep dive with Dr. Snyder dismantles the myth that there’s a universal approach to healthy eating, exercising, or managing glucose.
The best path forward? Test. Track. Personalize.
- Use a CGM to discover how your body responds to foods.
- Move regularly, especially after meals.
- Get quality sleep on a consistent schedule.
- Choose exercise and nutrition plans that match your unique biology.
In a world of oversimplified diet rules and generic wellness advice, this personalized approach could be the key to not just managing weight or blood sugar — but optimizing healthspan, energy, and longevity.
