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October 16, 2026 — FxNutrition Intelligence
Evidence-driven intelligence for functional nutrition practitioners
A Nutrishify publication • Week of October 16, 2026
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A fresh look for Nutrishify. Our new website is live at nutrishify.com: cleaner, faster, and easier to find what you need. One change to know about: the three most recent issues are now free to read on the site, and older issues are moving to a premium archive that’s coming soon. The Friday Brief itself stays free, and every new issue will keep landing right here in your inbox.
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Evidence Spotlight
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Four Diets in Type 2 Diabetes
A meta-analysis of 25 randomized trials compared four eating patterns in adults with type 2 diabetes: Mediterranean, intermittent fasting, energy restriction, and ketogenic. Pooled fasting glucose and HbA1c moved down, and weight fell by about 3 kg overall, but the trials disagreed sharply. Prediction intervals crossed no effect, so the authors would not rank one pattern as clearly better.
The Mediterranean pattern was the most consistent for fasting glucose. None of the four showed a clear advantage on lipids. Ketogenic diets had more reported side effects, including stomach symptoms and short-lived low blood sugar. The review was registered after the work was underway, and some included trials also changed exercise, so the diet itself is not cleanly separated.
Takeaway: These trials support movement in glucose and weight with each of the four patterns, and they do not support naming a single winner. Ketogenic diets carried more reported side effects.
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Whey, Vitamin D, and Leucine in Sarcopenia
A network meta-analysis of 20 randomized trials, 2,160 adults aged 60 and older with sarcopenia or at high risk, compared nutritional formulas on muscle mass, grip strength, gait speed, and a sit-to-stand test. Across trials, supplements improved the muscle-mass index, grip strength, and gait speed. The pooled sit-to-stand result was not significant.
Whey protein plus vitamin D plus leucine improved the muscle-mass index (standardized mean difference 0.29), grip strength (0.82), and sit-to-stand time (−1.41). Two other formulas looked strong on single outcomes, and each rested on one trial. Certainty for the main comparisons was low to very low, and dropping individual trials changed some estimates. The authors report no conflicts of interest.
Takeaway: Whey, vitamin D, and leucine is the formula that moved several muscle measures at once. Treat the size of those effects as uncertain.
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L-Arginine Dose and Fatigue
An 8-week randomized, double-blind trial gave working-age adults with persistent fatigue oral L-arginine at 3 g/day, 6 g/day, or placebo. Of 120 people randomized, 119 were analyzed. The Fatigue Severity Scale fell 6.41 points with 6 g/day and 2.23 points with placebo. The 3 g/day dose did not differ from placebo.
A second fatigue score was less convincing after the researchers adjusted for testing several outcomes at once. Fatigue improved, but it did not fully resolve. The trial was industry-funded, and a company supplied the product.
Takeaway: 6 g/day of L-arginine reduced fatigue severity versus placebo over 8 weeks, and 3 g/day did not. Fatigue improved, but it did not fully resolve.
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By The Numbers
⬇︎6.41
Fatigue was reduced by 6.41 points on the Fatigue Severity Scale with 6 g/day of L-arginine.
Placebo improved 2.23 points; the 3 g/day dose showed no clear additional benefit.
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Clinical Pearl
Whey, vitamin D, and leucine improved muscle scores
In a network meta-analysis of 20 trials and 2,160 older adults, that combination improved muscle-mass index, grip strength, and sit-to-stand time. Certainty was low to very low, and some competing formulas rest on a single trial.
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Recent Podcasts
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Calming Mast Cell Activation Syndrome (MCAS), Histamine Peptides, Ozempic Butt, Burnout & Creatine | Ask Me Anything
The Art of Being Well • October 15, 2026
Useful if clients are asking about mast cell symptoms or muscle loss on GLP-1 medicines. Dr. Will Cole fields questions on calming mast cell activation syndrome, including peptides such as BPC-157 when histamine intolerance is part of the picture, and on creatine when muscle loss shows up with GLP-1 medicines. Listen →
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Cortisol, Attachment & the Physiology of Relational Stress
The DUTCH Podcast • October 13, 2026
Useful if you are refining how you discuss cortisol and stress physiology with clients. Dr. Jaclyn Smeaton talks with Sabrina Zohar about attachment, the nervous system, and cortisol along the HPA axis, including how that physiology shows up in sex hormones, sleep, and mood. The conversation is about relational stress as a hormone pattern, not a supplement protocol. Listen →
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How Food Choices Shape Memory, Cognition & Cravings | Dr. Scott Kanoski
Huberman Lab • October 12, 2026
Especially relevant if clients ask how everyday food choices relate to cravings and memory. Andrew Huberman interviews Dr. Scott Kanoski, a University of Southern California professor of human and evolutionary biology and neurobiology, on how different foods relate to memory, cognitive function, and cravings. Listen →
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What Nutrition Scientists Actually Agree On with Christopher Gardner, PhD | MGC Ep. 127
The Mind-Gut Conversation • October 12, 2026
A good listen when clients are stuck between conflicting nutrition headlines. Dr. Emeran Mayer talks with Stanford professor of medicine Christopher Gardner about Gardner’s book Food Sense and where nutrition scientists agree more than headlines imply. The draw is the consensus map, not a single nutrient debate. Listen →
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The Gut Ecosystem: An Update on How Keystone Species Shape the Microbiome
The Root Cause Medicine Podcast • October 9, 2026
Useful if you are updating how you talk about keystone gut species with clients. Dr. Lara Zakaria hosts Dr. Oscar Coetzee on keystone commensals and how microbial communities interact in the gut. Listen →
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Mark Your Calendar
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October 19
Supplements for Bone Health during Perimenopause
Practitioner Training | Bloom & Grow Academy | 5–6:30 PM ET | CEUs available | Register →
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October 21
From Symptoms to Cellular Support: Gut Microbiome Testing Meets Urolithin A in Menopause
Webinar | Tiny Health and Timeline | 1-2 PM Central | Register →
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October 21
Treating the Metabolic Root of Chronic Illness: How Glucose, Inflammation, and Gut Health Predict Recovery
Webinar | ecoNugenics Professional | 3 PM PT | Register →
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October 28
The Mitochondrial Universe: Part 2
Webinar | BodyBio | 12–1 PM ET | Register →
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November 3
Beyond Estrogen: How Hormones Regulate Bone Health
Webinar | American Nutrition Association | 5 PM EST | CEUs available | Register →
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Org/Industry Updates
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Mycotoxin Panel Now Lists 31 Markers
US BioTek now reports up to 31 mycotoxins on its Mycotoxin Extensive Panel, and the same panel is included in All-Tox and MOE-Tox Complete. The product page lists 31 urine markers across aflatoxins, gliotoxin, ochratoxin A, trichothecenes, zearalenone, and other mycotoxins, run by LC-MS/MS. Read more →
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Tech Tip
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That New AI Note-Taker Isn’t Built for Client Sessions
ChatGPT’s new Meetings plugin (beta, Mac desktop app, Pro and Business plans) records a call through the computer’s microphone and system audio, then saves a summary and action items. No bot joins the call, so other participants get no notice; OpenAI’s help page says to get everyone’s consent first. For client work, the catch is privacy: Pro and Business aren’t on OpenAI’s list of HIPAA-eligible products, so no BAA is available. HIPAA doesn’t legally apply to every practice (insurance billing is usually what triggers it), but professional standards and client trust still call for protecting health information. Do this: If you use this tool, avoid sharing identifiable client information. For clinical sessions, choose a platform with appropriate privacy safeguards and a BAA when required.
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