Nicole Kaldes

Nicole Kaldes is a journalist and communications executive who has spent her career covering health and wellness. She has been a contributor to The New York Times Health section and to The Economist, and is a co-founder of The Skinny, a health and wellness newsletter. At Eat Fit Fuel she leads editorial across nutrition, fitness, and healthy living, with a focus on turning research and expert guidance into something readers can actually use. She is based in New York City and studied at the University of Colorado Boulder.

Sleep and Weight Loss: Why Short Sleep Costs You Muscle, Not Just Willpower

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A dark quiet bedroom with morning light at the window

Sleep is the most underrated variable in body composition. Not because sleeping burns meaningful calories — it does not — but because short sleep systematically makes every other part of a diet harder. It raises hunger, lowers satiety, pushes food choices toward calorie-dense options, reduces spontaneous movement, and, in the most striking research finding, changes … Read more

Best Electrolyte Powders, Compared by Sodium (and When You Actually Need One)

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A glass of water with citrus on a table

Electrolyte powders are sold as though everyone needs one. Most people don’t. If you eat a normal diet and sweat moderately, you are getting adequate sodium and potassium from food, and an electrolyte packet is flavored water with a marketing budget. Where they genuinely earn their place: long or hot training sessions, heavy sweaters, low-carb … Read more

The 10 Best Creatine Supplements (and What Not to Waste Money On)

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Scoop of creatine monohydrate powder beside a shaker bottle

Creatine is the rare supplement where the buying decision should be boring. The compound that works is creatine monohydrate, it costs very little, and no premium form has been shown to beat it. What actually separates products is purity, third-party testing, how well it mixes, and price per serving — not the marketing on the … Read more

Intermittent Fasting: What the Evidence Actually Shows

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Intermittent fasting has been sold as a metabolic hack, a longevity protocol, and a fat-loss shortcut. The research picture is considerably less dramatic than any of that: it is a reasonably effective way for some people to eat less, it has a handful of interesting effects independent of calorie reduction, and it is actively a … Read more

Walking for Weight Loss: Steps, Calories, and What Actually Works

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Walking is the most underrated fat-loss tool available, and the reason is boring: it works because you will actually keep doing it. High-intensity training burns more calories per minute, but it also generates fatigue, requires recovery, drives appetite up in some people, and gets abandoned. Walking generates almost no fatigue, requires no recovery, and can … Read more

Creatine Monohydrate: The Complete Guide to Dosing, Loading, and Side Effects

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Creatine is the most studied sports supplement in existence — more than a thousand peer-reviewed papers, several decades of use, and a safety record that no other performance supplement comes close to matching. It is also the one people get wrong most often, usually by overcomplicating it: loading protocols they do not need, expensive forms … Read more