The Verdict — new studies, explained

Guides on this topic

• Keto for Beginners: What Your First Week Is Really Like
• Creatine: How Much to Take, When, and Who It Helps
• Keto Flu and Electrolytes: What Helps, in Safe Amounts
• How to Lose Fat Without Losing Muscle
• Keto and Cholesterol: Why LDL Rises in Some People
• Morning Sunlight: Why It Matters and How Long You Need
• Caffeine Before a Workout: How Much and How Long Before
• The Physiological Sigh: How to Do It and What It Does
• Electrolytes While Fasting, and What Breaks a Fast
• Magnesium for Sleep: Which Type and How Much
• How Many Sets per Muscle per Week to Build Muscle
• Can You Reset Your Dopamine? What the Science Says
• Keto and Exercise: Strength, Cardio and HIIT
• Ice Bath or Sauna After a Workout? What the Trials Show
• The Best Temperature for Sleep: What the Studies Show
• How to Improve Gut Health: What the Studies Show
• Blood Sugar Spikes After Eating Without Diabetes
• How Much Omega-3 per Day? What the Trials Show
• VO2 Max by Age: What's Good and How to Improve It
• Biohacking for Beginners: What's Worth It, What Isn't
• Spaced Repetition Schedule: When to Review for Exams

• Does Exercise Stop You Losing Muscle on a Diet? 34 Trials, 1,455 Adults

  Keep it · 2026-11-07

  A 2026 review of 34 trials in 1,455 adults: adding exercise to a calorie deficit kept 0.87 kg more lean mass and cut its loss by nearly half. Mixed and strength training did best.

• Rest-Pause or Drop Sets When Your Reps Stall? An 8-Week Trial in 23 Lifters

  Keep it, with a caveat · 2026-11-04

  A 2026 randomised trial gave 23 trained adults either rest-pause or drop sets once their reps stalled. Lean mass and bench press rose in both, with no clear winner.

• Does Lifting Weights Build Bone After Menopause? 17 Trials in 690 Women

  Keep it, with a caveat · 2026-11-01

  A 2025 meta-analysis of 17 trials in 690 healthy postmenopausal women: strength training improved hip and spine bone density, most clearly with heavier loads.

• Does Dieting Burn Your Muscle? A 6-Month Trial Scanned 374 Adults

  Keep it, with a caveat · 2026-10-31

  In a 6-month diet trial, 374 adults lost 5.9–7.18 kg, mostly fat. Lean tissue in the arms and legs, a stand-in for muscle, fell only 0.80–1.02 kg.

• Exercise Snacks and VO2 Max: What 21 Trials Found

  Keep it, with a caveat · 2026-10-28

  A 2026 meta-analysis of 21 trials in 921 adults: short bouts of exercise spread through the day raised VO2 max, but body fat and cholesterol didn't improve.

• Do You Need Lots of Carbs to Build Muscle? A Meta-Analysis of 11 Trials

  Drop it · 2026-10-22

  A 2026 meta-analysis pooled 11 randomised trials that changed carbohydrate intake, but not protein, during strength training and measured muscle size.

• Does Lifting Weights Slow Brain Ageing? A Trial in 309 Adults Aged 62–70

  Keep it, with a caveat · 2026-10-19

  A 2026 analysis of a randomised trial gave 309 healthy adults aged 62–70 a year of heavy, moderate or no strength training, then estimated their brain age from MRI scans.

• How Much Exercise Improves Sleep After 60? 62 Trials Looked at Type and Dose

  Keep it · 2026-10-16

  A 2025 network meta-analysis of 62 trials and 5,005 adults over 60 found exercise improves sleep quality. Cardio plus strength ranked best; more wasn't always better.

• Does Sitting Less Help You Burn Fat? A 6-Month Trial Measured Metabolic Flexibility

  Too early to tell · 2026-10-15

  In a 6-month Finnish trial of 64 sedentary adults, coaching to sit an hour less a day didn't change metabolic flexibility. Only people who cut 30+ minutes improved.

• Time-Restricted Eating vs a Dietitian: What a 12-Month Trial Found

  Keep it, with a caveat · 2026-10-14

  A 2026 randomised trial of 247 adults compared a 9-hour eating window with personalised dietitian advice. Same weight loss, better adherence — but not better cholesterol.

• Does a Cold Plunge After HIIT Kill Your Gains? A 5-Week Trial Checked the Muscle

  Keep it, with a caveat · 2026-10-14

  Men did HIIT three times a week for five weeks, half with an 11 °C ice bath after every session. Muscle biopsies and fitness tests showed no difference — good or bad.

• Sauna After Your Workout Won't Boost Your HRV, an 8-Week Trial Finds

  Drop it · 2026-10-14

  Sedentary adults trained three times a week for eight weeks, some with a 15-minute sauna after every session. Exercise moved heart-rate measures; the sauna added nothing to HRV.

• Does Ashwagandha Make You Fitter? What 13 Trials Actually Show

  Keep it, with a caveat · 2026-10-14

  A 2026 meta-analysis of 13 randomised trials found ashwagandha may help endurance a little. Strength and power evidence is weak, and results vary a lot between studies.

• More Caffeine Isn't Better: ~3 mg/kg Worked Best in 48 Studies

  Keep it · 2026-10-14

  A 2025 network meta-analysis of 48 placebo-controlled studies found a low caffeine dose in capsule form improved time-trial performance as much as higher doses — with fewer side effects.

• Why Stretching Works: It's Mostly Your Nervous System, Not Longer Muscles

  Keep it · 2026-10-14

  A 2025 meta-analysis of 65 studies found long-term static stretching improves flexibility mainly by raising stretch tolerance and slightly reducing stiffness — not by lengthening muscle fibres.

• Omega-3 for Your Brain: Promising, but the Evidence Is Messier Than the Headlines

  Too early to tell · 2026-10-14

  A 2025 dose-response meta-analysis of 58 trials linked omega-3 to modest gains in some cognitive tests, most consistently at 1–2.5 g a day. But most studies were low quality and results varied widely.

• A Fibre Supplement for Prediabetes Didn't Work on Average. For Some People, It Did

  Too early to tell · 2026-10-14

  In a 2025 trial of 802 adults with prediabetes, 45 g a day of fibre supplement didn't beat standard advice overall. Follow-up analysis suggests your gut microbiome decides who benefits.

• Drop Sets, Cluster Sets, Flywheels: Do Advanced Methods Build More Muscle?

  Drop it · 2026-10-14

  A 2026 network meta-analysis of 62 studies found no clear advantage of advanced resistance-training methods over traditional sets for strength, power or muscle growth in most people.

• 10 Minutes of Slow Breathing, Twice a Day: A 12-Week Trial in Stressed Students

  Keep it, with a caveat · 2026-10-14

  Paramedic students who practised 5-second-in, 5-second-out breathing reported lower stress, anxiety and depression during exams than controls. Half the breathing group dropped out, though.

• Creatine After 45: Muscle Gains Even Without Exercise, in a 12-Week Trial

  Keep it · 2026-10-14

  Adults aged 45–65 took 10 g of creatine or placebo daily for 12 weeks. Creatine increased lean mass and strength with or without an exercise plan, and was well tolerated.

• Does Vitamin D Raise Testosterone? A 2026 Meta-Analysis of Randomised Trials

  Drop it · 2026-10-14

  A 2026 meta-analysis pooled randomised trials in adult men. Vitamin D supplements made no clear difference to total testosterone, SHBG or free testosterone markers.