Root-Cause Nutritional Consulting in Scottsdale, AZ
Your food plan is set from your own allergy and lab testing by clinicians who also treat gut, immune and chronic illness.

- Led by Dr. Isaac Yosef, NMD
- Advice based on allergy testing
- GI care with Lina Kay, PA-C
- Food, supplement and IV dosing
Nutrition Advice Built on Your Testing
Nutritional consulting at our clinic is medical care, not a printed meal plan. We base your advice on allergy testing, your health history and your own goals, so the foods you eat and avoid have a clear reason behind them.
Diet is one part of a root-cause plan. When testing shows a vitamin or mineral shortfall, we correct it with customized oral and IV dosing, then recheck your levels.
Concerns We Address Through Diet
Many of our patients come in with long-running symptoms that a general diet has not changed.
SIBO and SIFO
Food choices that support treatment of bacterial or fungal overgrowth in the small intestine.
IBS
Finding the foods behind bloating, cramping and irregular digestion.
Histamine Intolerance
Guidance on high-histamine foods when flushing, headaches or hives follow meals.
Food Allergies and Sensitivities
Advice drawn from your allergy testing rather than trial and error.
Chronic Fatigue
Nutrition that supports energy as part of a plan for chronic fatigue syndrome.
Lyme Disease
Diet that supports the body while Dr. Yosef treats the root causes of illness.
Mold Illness
Food guidance that works alongside the environmental side of mold care.
Inflammatory Disorders
Eating patterns chosen to calm ongoing inflammation.
Weight Loss Goals
A food plan paired with supplements or injection therapies when they fit.
Testing That Shapes Your Plan
General diet advice guesses at what your body needs. We measure first.
Allergy Testing
Shows which foods and other allergens your body reacts to, so they can be removed or reduced.
Blood and Urine Tests
Customized panels that measure vitamin and mineral levels and point to deficiencies.
EAV Testing
Electrodermal Acupuncture According to Voll, part of our integrative workup.
We go over every result with you, so you know why each food change or supplement is on your plan.
What Your Nutrition Plan Can Include
Food comes first. When testing shows a gap that diet alone will not close, we add targeted support and track how your levels respond.

Personalized Food Guidance
Which foods to remove, reduce or add, set from your allergy results, digestion and goals. The plan is written to fit how you actually cook and eat.
Targeted Oral Supplements
Vitamins and minerals dosed to your test results as part of our orthomolecular approach. See how we choose physician-guided supplements.
IV Nutrient Dosing
When the gut absorbs nutrients poorly, customized IV therapy delivers them straight into the bloodstream while diet keeps levels steady.
Weight Loss Support
Oral supplements and injection therapies to support weight loss, used alongside your food plan when they suit your history.
Allergy Desensitization
Custom homeopathic and isopathic drops through our allergy desensitization program, for patients whose testing shows reactions worth calming.
The Clinicians Behind Your Plan
Your nutrition advice comes from the same clinicians who order and read your testing.

Dr. Isaac Yosef, NMD
Integrative Physician
Treats chronic, elusive illness such as CFS and Lyme disease by finding root causes, imbalances and toxic overload.

Lina Kay, PA-C, MS
GI and Environmental Medicine
Extensive experience with SIBO, SIFO, IBS, histamine intolerance and mold illness.
Your Nutritional Consulting Visits
Your plan has checkpoints, so the advice changes as your body does.
- 1
Consultation
We go over your symptoms, digestion, diet, health history and goals.
- 2
Testing
Allergy testing and customized blood and urine tests show what to change.
- 3
Your Plan
We walk you through your food guidance and any supplement or IV dosing.
- 4
Follow-Up and Retesting
We check how you feel and recheck levels, then adjust the plan.
Cost of Nutritional Consulting
The cost depends on the testing you need and how many follow-up visits your plan includes. We quote it after your consultation, before any testing begins.
Nutritional Consulting Questions, Answered
What does a holistic nutritionist do?
A holistic approach to nutrition looks at the whole person rather than one number or one symptom. At our clinic, food advice is set by an integrative physician and a physician assistant who also review your testing, digestion, history and goals. Diet is one part of a plan that aims at the root cause.
Is a dietitian or a nutritionist more qualified?
The two titles have different training paths. Our nutritional counseling is provided by medical clinicians: Dr. Isaac Yosef, NMD, and Lina Kay, PA-C, MS. They can order and read lab and allergy testing, then set food, supplement and IV dosing from the results.
How much does nutritional consulting cost in Scottsdale, AZ?
The cost depends on the testing you need and how many follow-up visits your plan includes. We quote it once your consultation is done, so you know the cost before testing begins.
Do you test for food allergies before giving diet advice?
Yes. Our nutritional advice is based on allergy testing along with your own needs and goals. Customized blood and urine tests can also show nutrient shortfalls that diet alone may not fix.
Can nutrition counseling help with SIBO, IBS or histamine intolerance?
Diet is a large part of managing these conditions. Lina Kay, PA-C, has extensive experience treating SIBO and SIFO, IBS and histamine intolerance, and she works the food plan into the rest of your treatment.
Do you help with weight loss?
Yes. Weight loss plans can pair nutritional counseling with oral supplements and injection therapies we offer to support weight loss. We review your history first to choose what is suitable for you.