HAVIT Blog

Science-backed guides on habits, sleep, nutrition, and movement.

LatestGLP-1 and Metformin Together: Why Two Old Friends Beat Going SoloGLP-1 medications and metformin lower blood sugar through different mechanisms, which is why they're commonly used together; most GLP-1 diabetes trials tested them as add-ons to metformin.

LatestBile Acid Malabsorption Diet for Chronic Diarrhea: Fat Modification and Fiber Strategies That Actually WorkDiet for bile acid malabsorption centers on lowering fat—in one clinic study, intake fell to about 42 g a day and urgency, bloating and stool frequency improved—with soluble fiber and meal timing as practical extras. The evidence is still limited, and many people also need medication.

LatestSatiety Index Chart: 38 Foods Ranked by Fullness and the Science of Staying FullThe satiety index ranks how full 38 common foods keep you per 240-calorie portion, compared with white bread at 100: boiled potatoes scored highest (323) and croissants lowest (47). Boiled potatoes still reign supreme for fullness, but combining protein, fiber, and water content creates meals that satisfy for hours.

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Why Your Personality Type Predicts Which Workouts You'll Actually Stick With

Matching your workout style to your personality traits can increase long-term exercise adherence by up to 40%, according to 2024-2025 research.

Exercise Response Genotype: Why Some People Need 40% More Training Volume

Genetic variants in ACTN3 and ACE genes create 'high' and 'low' responders—low responders need roughly 40% more training volume to achieve equivalent adaptations.

Exercise Snacks: Why 1-Minute Movement Bursts Beat Your 45-Minute Gym Session

Brief 1-2 minute movement bursts every hour can match traditional workout benefits for blood sugar control and metabolic health.

How to Calculate Your Sweat Rate: A Complete Guide to Personalized Hydration in 2026

Weigh yourself before and after exercise, track fluid intake, and divide by workout duration to find your hourly sweat rate—then adjust for intensity and heat.

Undigested Food in Your Stool? The Hidden Condition 90% of Doctors Miss

EPI causes fat malabsorption and undigested food in stool—fecal elastase testing catches it, and enzyme replacement therapy restores normal digestion for most people.

Wet Bulb Temperature and Exercise: The Heat Safety Threshold Your Fitness App Doesn't Show

When wet bulb temperature exceeds 28°C, even fit athletes face serious heat illness risk—here's how to calculate your safe workout intensity.

Your Hemoglobin Is Fine, So Why Are You Exhausted? The Ferritin Gap Nobody Talks About

Ferritin below 30 ng/mL causes fatigue even with normal hemoglobin—aim for 50-100 ng/mL through strategic iron-rich foods and absorption enhancers.

Fiber for Weight Loss: The Exact Grams You Need for Real Satiety

Eating 25-35g of fiber daily can reduce appetite by up to 31%, with viscous fibers before meals showing the strongest satiety effects.

Fiber for Satiety and Weight Management: Soluble vs Insoluble Types Compared

Soluble fiber wins for satiety due to gel formation and gut hormone activation, but combining both types delivers the best weight management results.

Fiber for Satiety and Weight Management: Which Types Work Best and How Much You Actually Need

Viscous soluble fibers like beta-glucan and psyllium outperform other types for satiety, with 25-30g daily being the threshold where weight management benefits become significant.

Fiber Types and Your Gut Microbiome: Which Fibers Feed Which Bacteria in 2026

Different fiber types feed different gut bacteria—soluble grows Bifidobacteria, insoluble supports Firmicutes, and resistant starch cultivates butyrate producers.

The Hidden Calorie Burn: How Fidgeting and Spontaneous Movement Shape Your Metabolism

Fidgeting and spontaneous movement (NEAT) can account for up to 2,000 calories daily, with lean individuals naturally moving 2.5 hours more than those with obesity—and these patterns can be modified.