A leading expert in nutrition writing and science journalism.

Kelsey Costa, MS, RDN

A research-savvy registered dietitian with a background in English, nutrition, and health science.

As a writer for your organization, she contributes:

  • An established, expert voice

  • A clear and professional writing style

  • Accurate and up-to-date research insights

  • An engaged and connected audience

  • Tailored literacy levels, tone, and writing formats

  • Enhanced authority and reputation in nutrition and health promotion

Kelsey’s current author pages

Featured content

  • 8 Food and Nutrition Trends for 2025, Predicted By The Experts

  • A Common Low-Calorie Sweetener May Raise Blood Clotting Risk

  • Can a Healthy Diet Help Alleviate Chronic Pain?

  • Are Protein Bars Health Food or Hype? A Dietitian Shares What to Look for, and What to Avoid

Latest bylines

Nutrition and health science, news, and feature articles

Updated February 14, 2025.

February 2025

Potassium-enriched salt substitutes tied to lower stroke-related risks, Medical News Today, February 14, 2025.

What to Eat for Breakfast If Trying to Achieve a Calorie Deficit, MyFitnessPal Blog, February 12, 2025.

What a Dietitian Wants You to Know About Artificial Dyes, MyFitnessPal Blog, February 12, 2025.

What to Eat After Fasting (and What to Avoid), According to a Dietitian, GoodRx, February 6, 2025.

What People Eat Around the World on Valentine’s Day, MyFitnessPal Blog, February 4, 2025.

Is Extra-Virgin Olive Oil Really a Health Food?, MyFitnessPal Blog, February 3, 2025.

January 2025

How a Mediterranean diet might protect the brain's white matter, Medical News Today, January 30, 2025.

How Adam Devine Uses MyFitnessPal to Achieve His Health Goals, MyFitnessPal Blog, January 15, 2025.

100 Years of Fad Diets: Experts Weigh In, MyFitnessPal Blog, January 15, 2025.

Sober Curious? Here’s a Dietitian’s Guide to Doing Dry January Right, MyFitnessPal Blog, January 7, 2025.

The Best (And Worst) Foods to Eat Before You Fly, According to a Dietitian, GoodRx Health, January 2, 2025.

December 2024

Can a healthy diet help alleviate chronic pain?, Medical News Today, December 23, 2024.

8 Food and Nutrition Trends for 2025, Predicted By The Experts, MyFitnessPal Blog, December 6, 2024.

How might drinking coffee alter your gut microbiome?, Medical News Today, December 1, 2024.

November 2024

How to Prepare Thanksgiving Dinner for Less, According to a Dietitian, MyFitnessPal Blog, November 13, 2024.

Ultra-processed foods may accelerate biological aging, Medical News Today, November 13, 2024.

How MyFitnessPal Can Support Your GLP-1 Journey, MyFitnessPal Blog, November 11, 2024.

Classic and green Mediterranean diets may help slow brain aging, Medical News Today, November 9, 2024.

Higher zinc intake may increase endometriosis risk, Medical News Today, November 5, 2024.  

Vegetarian diets can protect against diabetes, cardiovascular diseases, Medical News Today, November 2, 2024. 

October 2024

Low-carb diet may eliminate need for drugs in type 2 diabetes, Medical News Today, October 25, 2024.

Having a 'sweet tooth' may raise risk of conditions like depression and diabetes, Medical News Today, October 22, 2024.

Dietitian Reacts to TikTok’s New “Protein Soda” Trend,” MyFitnessPal Blog, October 17, 2024.

What to Know About Banana Nutrition (& Extinction!), MyFitnessPal Blog, October 8, 2024.

Are Protein Bars Health Food or Hype? A Dietitian Shares What to Look for, and What to Avoid, GoodRx Health, October 7, 2024.

Are You Getting Enough Nutrients? Find Out What 5 Billion People Are Missing, MyFitnessPal Blog, October 3, 2024.

Daily consumption of coffee compound may aid weight loss and fat reduction, Medical News Today, October 2, 2024.

September 2024

Eating Brazil nuts daily may reduce inflammation, improve gut health, Medical News Today, September 30, 2024.

Daily flavonoid-rich food intake may lower dementia risk by 28%, Medical News Today, September 25, 2024.

Moderate Coffee Consumption Linked to Lower Risk of Heart, Metabolic Diseases, Healthline, September 17, 2024.

Low-carb diets may support heart health, but how nutritious are they?, Medical News Today, September 13, 2024.

How do keto, Mediterranean diet, or intermittent fasting lead to healthy aging?, Medical News Today, September 9, 2024.

August 2024

August 30, 2024 — Should You Count Macros or Calories to Lose Weight? The Edge.

August 21, 2024 — Eating more plant fats from grains, vegetable oils may lower death risk. Medical News Today.

August 16, 2024 — Low-fat vegan diet better than Mediterranean diet for weight loss, metabolic health. Medical News Today.

August 13, 2024 — A Common Low-Calorie Sweetener May Raise Blood Clotting Risk. Healthline.

August 12, 2024 — Keto diet may increase 'bad' cholesterol, reduce bacterial diversity in the gut. Medical News Today.

August 9, 2024 — Is Dried Fruit Good for You? We Asked a Dietitian. GoodRx Health.

July 2024

July 31, 2024 — Listeria Outbreak Prompts Nationwide Deli Meat Recall, What to Know. Healthline.

July 29, 2024 — An 8-week short-term vegan diet may help reduce biological age. Medical News Today.

July 25, 2024 — Moderate drinking does not boost longevity, new evidence warns. Medical News Today.

July 16, 2024 — Mediterranean diet may help boost longevity in cancer survivors. Medical News Today.

July 9, 2024 — Carbs vs. fat vs. protein: Which one triggers more insulin release? Medical News Today.

July 8, 2024 — How does a ketogenic diet stave off weight gain? Medical News Today.

June 2024

June 28, 2024 — Daily multivitamins may not promote longevity, study finds. Medical News Today.

June 24, 2024 — This Dietitian-Approved Carb Cycling Meal Plan Can Help You Lose Weight and Gain Muscle. The Edge.

June 20, 2024 — High-fat diet may disrupt gut bacteria, fuel anxiety. Medical News Today.

June 18, 2024 — Switching to a protein-rich diet may change gut bacteria and aid weight loss. Medical News Today.

June 16, 2024 — Could pomegranates help aid memory and ease Alzheimer’s symptoms? Medical News Today.

June 12, 2024 — Eating more choline may help lower heart disease risk. Medical News Today.

June 9, 2024 — Can eating chili peppers actually increase obesity risk? Medical News Today.

June 4, 2024 — Intermittent fasting plus protein pacing may boost weight loss, gut health. Medical News Today.

May 2024

May 17, 2024 — Ketogenic diet may help lower stress and boost mental health, researchers say. Medical News Today.

May 4, 2024 — Ancient grains linked to improved type 2 diabetes outcomes. Medical News Today.

April 2024

April 29, 2024 — Regularly eating avocado linked to lower diabetes risk in women. Medical News Today.

April 25, 2024 — Dietary interventions better than medication for IBS management. Medical News Today.

April 22, 2024 — Roasted green tea, a Japanese staple, could boost cognitive performance. Medical News Today.

April 11, 2024 — Could swapping beef for fish like sardines help prevent early death? Medical News Today.

April 7, 2024 — A keto diet may help improve severe mental health, metabolic symptoms. Medical News Today.

March 2024

March 30, 2024 — An avocado a day may improve diet quality, researchers suggest. Medical News Today.

March 25, 2024 — Frequently reusing frying oil may accelerate brain damage. Medical News Today.

March 15, 2024 — What type of keto diet might boost lung cancer prevention? Medical News Today.

March 2, 2024 — Flavonol-rich foods may help lower disease risk, boost longevity. Medical News Today.

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