Fitties Journal

Antioxidants help protect cells from oxidative stress, but the supplement aisle offers dozens of options with vastly different mechanisms. This guide breaks down how each major antioxidant works, what the...

Bifidobacterium animalis subsp. lactis B420 (HOWARU Shape) is a patented probiotic strain with clinical trial evidence supporting its role in healthy body composition, gut barrier function, and appetite regulation. This...

Probiotics are live beneficial microorganisms that support digestive health, immune function, and overall wellbeing. This guide covers how they work, which strains matter, how to select and take a quality...

Magnesium is involved in over 300 enzymatic reactions, yet nearly half of Americans do not get enough. This guide compares supplement forms, explains why absorption varies so widely, and covers...

The supplement industry generates tens of billions in revenue every year, and a staggering amount of that comes from people buying products they do not need based on claims that...

Calculate body fat with the Yuhasz 6-site skinfold method, designed specifically for athletes and highly fit individuals. Free calculator with separate equations for males and females.

Calculate body fat with the Parillo 9-site skinfold method, the most detailed caliper-based formula available. Free calculator, the complete formula, and all nine measurement locations.

Calculate body fat with the Durnin-Womersley 4-site skinfold method. Free calculator with all 10 age-specific equations for males and females, measurement locations, and accuracy tips.

Calculate body fat with the Jackson-Pollock 7-site skinfold method, the most comprehensive JP formula. Free calculator, the complete formula, seven measurement sites, and accuracy tips.

Calculate body fat with the Jackson-Pollock 4-site skinfold method. Free calculator, the complete formula, and a worked example. Same four measurement sites for both males and females.

Calculate body fat with the Jackson-Pollock 3-site skinfold method. Free calculator, the complete formula with separate equations and measurement sites for males and females, plus a worked example.

Calculate body fat with the US Navy tape-measure method used by the Department of Defense. Free calculator, the complete formula for males and females, measurement locations, and accuracy tips.

A complete guide to body fat measurement. Compare methods from skinfold calipers and bioelectrical impedance to DEXA scans, with free calculators for seven of the most widely used formulas.

The ketogenic diet shifts your body's primary fuel source from glucose to fat through a high-fat, moderate-protein, very-low-carbohydrate eating plan. This guide covers the science of ketosis, the different keto...

A complete week-long keto meal plan with breakfast, lunch, and dinner for each day, designed to align with ketogenic macronutrient guidelines. Includes practical tips for meal preparation and staying on...

Athletes with digestive sensitivities face a double challenge: exercise itself can increase gut distress, and many sports nutrition products contain hidden FODMAP triggers. This guide covers the low-FODMAP protocol, how...

Collagen is the protein your body relies on more than any other, and production starts declining earlier than most people realize. This guide covers what collagen does, what the clinical...

Staying active in our golden years is more than just a recommendation; it's a necessity for overall well-being. This guide offers insights into the science of senior fitness, varied workout...