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Eat the Rainbow Week 3: Inflammation

August 3, 2026 By Julie Lanford MPH, RD, CSO, LDN

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Welcome to Week 3 of the Eat the Rainbow Fruit and Veggie Challenge! 

WEEK 3 TOPIC: Inflammation – What is it? 

Put simply, inflammation is part of the body’s immune response to injury and invasion. When your body is damaged (from a cut for example) or is exposed to a pathogen (like a virus), your immune system fights back by releasing immune cells to the site of damage. These cells help heal and protect your body by fighting off pathogens, removing dead cells, and repairing tissues. 

From what I just described, it probably seems like inflammation is a good thing – and under normal circumstances, it is! Our body uses the inflammatory response to protect itself and keep us healthy. 

However, it is thought that inflammation that occurs too often could be harmful to the body – this is known as chronic inflammation. 

Chronic inflammation can occur in response to many different things like a persistent injury, continued exposure to toxins, long-term stress, and gut issues. This chronic inflammation may then lead to health problems such as diabetes, heart disease, and cancer. 

Specific to cancer, there is a theory that chronic inflammation may play a role in tumor development and may also prevent cancer cells from dying. 

So how can you prevent and decrease inflammation in your body? We think one way is through your dietary choices! 

Eating a diet rich in vegetables, fruits, whole grains, nuts, beans, and fatty fish is known to decrease inflammation in the body. 

Fruits and vegetables are rich in phytonutrients – these are chemicals naturally produced by plants that help plants stay healthy, and have amazing benefits for humans as well. Phytonutrients are especially known for their anti-inflammatory properties. 

How can you increase the amount of phytonutrients in your diet? Aim for as much color as possible! Phytonutrients usually give fruits and vegetables their color, so try to eat a wide variety of vibrant produce like kale, spinach, and cherries. 

Want to know more? WATCH MY ANTI-INFLAMMATORY EATING WEBINAR HERE!

Week 3 Challenge

Eat the rainbow! Try to eat one fruit or vegetable from every color of the rainbow this week. Here are some ideas for each color:

  • Red: tomatoes, apples, raspberries, strawberries, red bell pepper 
  • Orange: carrots, orange, tangerine, clementine, cantaloupe, sweet potato, squash 
  • Yellow: bananas, yellow bell pepper, mango, yellow summer squash 
  • Green: kale, spinach, romaine, kiwi, green grapes, green apple, Bok choy, zucchini 
  • Blue: blueberries, blackberries 
  • Purple: red grapes, eggplant, beets

Keep track of your rainbow and send me pictures of your colorful fruit and veggies! 

Week 3 Produce Highlight: Romaine Lettuce

This leafy green is packed with vitamins, minerals, and phytonutrients. It is especially high in vitamins A, C, and K. 

  • Vitamin A = essential for maintaining proper eye, kidney, lung, and liver function. 
  • Vitamin C = powerful antioxidant that can protect the body from damage. 
  • Vitamin K = important for blood clotting, calcium levels, and maintaining bone density. 

How to Use

Fresh in salads, sandwiches, wraps, etc. Romaine lettuce can be a great addition to many dishes and can add a nice crunch! 

Week 3 Recipe! Salad in a Jar!

Print

Salad in a Jar with Basic Balsamic Dressing

Print Recipe

Use Romaine lettuce as your green of choice to give this crunchy veggie a try!

Ingredients

Salad

Options for marinated veggies:

  • Carrots

  • Cucumbers

  • Legumes

  • Tofu

  • Onions

  • Celery

Options for hard veggies:

  • Onions

  • Celery

  • Carrots

  • Cucumbers

  • Bell peppers

Options for other ingredients:

  • Tomatoes
  • Lettuce
  • Romaine
  • Kale

Balsamic Dressing

  • 3/4 cup olive oil

  • 1/4 cup balsamic vinegar

  • 2 Tbsp honey

  • 1 clove garlic, minced

  • Salt and pepper to taste

Instructions

Salad

  1. Grab a mason jar. Place veggies that would be good marinated in the jar first, then add dressing of choice (2 Tbsp for a quart sized jar).

  2. Layer in the other “hard” veggies.

  3. Add in your other ingredients. If adding cherry/grape tomatoes, leave whole so they do not get soggy. 

  4. Add in as much chopped lettuce/leafy greens to the top of the jar as possible.

  5. Place the top on your jar, and place in the fridge to eat later!

Dressing

  1. Whisk the vinegar in a bowl with the honey, garlic, salt, and pepper until well combined and the salt is dissolved. 

  2. Add in the olive oil and whisk until combined. 

  3. Taste and adjust seasonings.

Notes

If you want some specific ideas for salad in a jar combinations or fun salad dressings, check out these posts from Cancer Dietitian:

Greek chickpea salad in a jar

Thai chicken quinoa salad in a jar

Taco salad in a jar

Citrus vinaigrette

Ranch dressing

Did you make this recipe?

Share a photo and tag us — we can’t wait to see what you’ve made!

-Julie & The Interns

Eat the Rainbow Week 4: Crazy for Carbs
Eat the Rainbow Week 2: All About Fiber!

Filed Under: Eat the Rainbow!

This post may contain affiliate links for products I recommend. This means if you click on a link and purchase a product, Cancer Services, Inc. will receive a small percentage of the sale at no extra cost to you. We use these proceeds to support cancer patient direct services and community education in the Triad area of North Carolina. For more information, view our disclosure policy.

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