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Nutrition & Fitness Newsletter

Food, Medication and Supplement Interactions

If you’re taking medications or supplements consider the importance of exploring the best way to take them to get the anticipated results.  The timing of taking supplements, medications, along with eating and drinking certain foods and beverages can change the way nutrients are absorbed, or the way a medication is utilized in the body.  In addition, there can be additional side effects or changes to the potency of the medication depending on what you’ve eaten or drank with it.  However, with supplements, you may not absorb the full dose due to competition with other nutrients or minerals in the food.  Additionally, the supplement may be rendered useless if it is taken in combination with a particular medication or other supplement.  It’s a good idea to consult with your pharmacist or health care provider when taking medications and supplements to ensure that you’re taking them properly to optimize the results.

Here are some common interactions:
  • Grapefruit juice, even apple and orange juice can affect certain medications, increasing or lessening the potency.  For example, cholesterol lowering statins such as simvastatin and atorvastatin have a common interaction with grapefruit juice.  Grapefruit juice especially, inhibits a key enzyme that breaks down many drugs in the small intestine and liver.

  • Alcoholic drinks — interact with many antidepressants , anti-anxiety and allergy medications, in some cases increasing their effects.  Some potential side effects are drowsiness, dizziness, fainting and/or risk of overdose.

  • Vitamin K is in many foods and multivitamins, this vitamin can counteract blood thinners or anti-coagulant medications such as warfarin.

  • Thyroid medications may compete for absorption with minerals such as a in calcium supplement.  It may render the thyroid medication ineffective unless taken 2-3 hours away from each other.  Typically thyroid medications are taken on any empty stomach to improve absorption.

  • Certain antibiotics will not be absorbed if taken with calcium.  This so important if you’re fighting an infection and the antibiotic is unable to do its job.

  • Various medications can interact with each other creating unpleasant side effects or changing how much is absorbed.

Always consult a medical professional when taking medications and supplements.  Here are a few useful links:
Drug Interaction checker-
Look up a specific drug or supplement-
Medication interactions with alcohol and side effects-

If you're looking for an individualized approach to improving your life: from improving digestion, maintaining your brain, healthier food swaps, to ways to burn additional calories, eat well for the planet and incorporate "green exercise" into your routine, contact Sheri.

Here are few reasons to see a nutritionist/personal trainer/health coach: assess nutrient intake, disease prevention through diet, and exercise, maximize exercise performance, improve sleep quality, enhance mental clarity, optimize digestion and nutrient absorption, establish long-term healthy habits, meal planning for a whole foods diet and eat in a way to sustain the planet.  Please consider Sheri for nutrition counseling and/or fitness appointments to help you develop a healthier lifestyle for you and the planet. 


Straws Suck, the Anti-Straw Movement

Seattle has passed a ban on the use of plastic straws in order to decrease plastic waste.  This ban took effect July 1, 2018.  Food service businesses can no longer provide plastic straws and must provide compostable alternatives.  The Anti-Straw movement started with "Don't Suck" or "Straws Suck" campaigns in order to keep plastic straws out of the oceans and damaging sea life. 
To learn more visit:

Sheri is a Certified Nutritionist with a master's degree in nutrition, with over 15 years of clinical counseling experience, an ACE-certified Personal Trainer with advanced certifications in medical exercise, senior fitness and health coaching.  All nutrition consultations include exercise guidance, dietary analysis and meal plans to meet your individual lifestyle, calorie and nutritional needs.

Free introductory 15-minute appointments are also available.

To schedule an appointment with Sheri Mar, email:  or call:  206.789.6440

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