Tisha Castillo

Tisha Castillo is a health and nutrition coach in Arizona who helps people restore their metabolic health. She runs Simplified Health & Nutrition, a virtual practice built around metabolic dysfunction and insulin resistance. Her clients are mostly adults over 40 who want to avoid weight gain, chronic illness and reliance on medication. She holds board certification in health and wellness coaching and training in diabetes care and low carb eating. She also worked through chronic disease and eating disorders in her own life.

What Tisha helps with

Tisha works on metabolic dysfunction and insulin resistance, which she treats as the root of most non-infectious chronic disease. Her goal is to help clients stay healthy as they age.

• Restoring metabolic health
• Insulin resistance
• Metabolic dysfunction
• Diabetes
• PCOS
• Avoiding weight gain after 40
• Reducing dependence on medication
• Preventing chronic illness

Who Tisha works with

Tisha works with adults over 40 who face metabolic problems. Her focus includes people dealing with diabetes, insulin resistance, metabolic dysfunction and PCOS. They want to keep their weight in check, avoid chronic illness and rely less on medication as they age.

Background and qualifications

Tisha holds a Nutrition and Dietetics degree. She is a Metabolic Health Practitioner and a National Board Certified Health and Wellness Coach. She also has certifications in Community Nutrition, Diabetes Care and Education, and Nutrition and Health Promotion. She trained in the low carb and ketogenic lifestyle and in therapeutic carbohydrate restriction. She founded Simplified Health & Nutrition, a virtual health and wellness practice. Her own history with chronic disease and eating disorders shaped her work.

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Last updated September 2026. Request a correction.