Zenith Within by Dr. Sara Redondo
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The 66-Day Myth: What the Research Actually Says About How Long Habits Take
The "21 days to form a habit" claim came from a plastic surgeon's memoir, not research. Here is what the UCL study actually found, and why the number…
Jul 8
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Dr. Sara Redondo
10
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Longevity Through Nutrition: Five Things the Evidence Says That Most People Don’t Know, and the 28-Day Book I Wrote to Apply Them
Most nutrition advice is either too confusing or too generic to actually change anything. Here is what the evidence recommends instead.
Jul 5
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Dr. Sara Redondo
23
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GLP-1 Drugs: The Overlooked Side Effect, and Why Eating With Joy Might Be the Best Way to Avoid It
Most people are never told to watch for it, and once you know what it is, it changes how you eat on these medications. Here's my favorite recipe for…
Jul 1
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Dr. Sara Redondo
22
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The Probiotic Myth: What Actually Builds Gut Health
What the clinical evidence actually shows about probiotics, diversity, and what genuinely moves the needle, plus a downloadable probiotic and prebiotic…
Jun 26
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Dr. Sara Redondo
21
6
The Science of Aging: 12 Processes You Can Actually Slow
The hallmarks of aging framework made actionable, ranked by modifiability, with a downloadable longevity habits self-assessment.
Jun 24
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Dr. Sara Redondo
15
6
The Bone Disease That Begins Decades Before the Fracture — and Six Interventions That Actually Prevent It
Why the standard screening window is too late, the evidence-based framework for protecting bone before the damage is done, and a downloadable bone…
Jun 21
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Dr. Sara Redondo
18
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4 Blood Sugar Beliefs That the Evidence Has Overturned
What the research actually shows, and what most clinical appointments still haven’t caught up with.
Jun 18
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Dr. Sara Redondo
40
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Cortisol Isn’t the Problem. This Is.
Learn how cortisol should work, what happens when stress flattens your daily rhythm, and the evidence-based protocol to reset it.
Jun 11
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Dr. Sara Redondo
21
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The Viral Food Debates Just Got a Verdict from the Journal of the American College of Cardiology
14 cardiologists and nutrition scientists reviewed the evidence on beef tallow, seed oils, ultra-processed food, full-fat dairy, artificial sweeteners…
Jun 5
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Dr. Sara Redondo
17
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The Truth About Cold Plunges Nobody Explains
A practical guide to using cold plunges safely, separating real benefits from wellness hype, and knowing when not to plunge.
Jun 3
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Dr. Sara Redondo
16
6
The Lipid Number Your Blood Test Is Probably Missing — and Why It’s the Most Important One
A deep dive into the ApoB/ApoA1 ratio: what it is, what your targets should be, and exactly how to move it in the right direction.
May 26
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Dr. Sara Redondo
16
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The Cholesterol Conversation Has Been Half-Wrong for 30 Years
What the science actually shows, what the 2026 ACC/AHA guidelines just changed, and the risk factor 1 in 5 people carry without knowing it.
May 22
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Dr. Sara Redondo
28
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10
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