How to Customize the 21-Day Plan for Vegetarians and Flexitarians

A 21-day eating plan can be useful without requiring every participant to follow the same menu. Vegetarians and flexitarians can preserve the structure of Dr. Kellyann’s Bone Broth Diet while adjusting the protein sources, broth ingredients, fasting rhythm, and recipes to suit personal preferences.

The central idea is to create satisfying meals around nutrient-dense foods, adequate protein, healthy fats, vegetables, and practical routines. For vegetarians, the traditional animal-based broth needs a thoughtful substitute. Flexitarians have more flexibility and may include bone broth or occasional meat while keeping most meals plant-forward.

Customization works best when it respects both dietary choices and individual health needs. Anyone who is pregnant, managing diabetes, taking medication, recovering from illness, or has a history of disordered eating should seek professional guidance before changing meal timing or attempting mini-fasting.

Begin with the plan’s flexible framework

The 21-day schedule can be viewed as a framework rather than a rigid menu. Its main components—planned meals, broth-based nourishment, short fasting windows, movement, hydration, and lifestyle habits—can remain in place while the ingredients change.

Vegetarians might use a three-day rotation of plant-based breakfasts, vegetable-rich lunches, and protein-centered dinners. Flexitarians could reserve animal products for selected meals, such as chicken bone broth at lunch twice a week, while relying on beans, tofu, tempeh, eggs, or dairy at other times.

Before starting, identify non-negotiables. A vegetarian may avoid meat and fish but include eggs and dairy, while a vegan-leaning flexitarian may prefer plants most of the week and use animal products occasionally. Writing these boundaries down makes shopping and recipe planning easier.

Replace bone broth with purposeful alternatives

Traditional bone broth contributes fluid, savory flavor, protein, and collagen-related nutrients. A vegetarian substitute will not replicate every one of these qualities, so it is better to combine several foods instead of expecting one drink to do everything.

Mushroom broth can provide depth and umami, particularly when made with shiitake mushrooms, onion, garlic, celery, herbs, and kombu. Vegetable broth enriched with white beans, lentils, or blended tofu can offer more substance. Miso broth is another convenient option, although it can be high in sodium.

Flexitarians who enjoy animal products can use ready-to-heat bone broth occasionally and choose plant-based broths for other days. Vegetarians should remember that collagen powders and many collagen drinks are animal-derived. A plant-based plan can still support skin and connective-tissue nutrition through vitamin C-rich produce, protein, zinc, copper, and overall dietary variety, but it should not be marketed as containing vegan collagen.

Check labels carefully when purchasing packaged broth, protein powders, or prepared meals. Ingredients, allergens, sodium content, and storage directions vary, and the terms of service should also be reviewed when using products or purchasing materials through the site.

Build balanced vegetarian and flexitarian meals

A satisfying plate should contain a clear protein source, plenty of non-starchy vegetables, a moderate portion of high-fiber carbohydrates, and a little healthy fat. This balance can help reduce the hunger that sometimes follows a broth-only or overly restrictive meal.

Useful vegetarian proteins include lentils, chickpeas, black beans, edamame, tofu, tempeh, seitan, Greek yogurt, cottage cheese, and eggs. Flexitarians can add fish, poultry, or meat when desired, while keeping vegetables and legumes at the center of the meal.

Meal component	Vegetarian choices	Flexitarian choices	Practical portion guide
Protein	Lentils, tofu, tempeh, eggs, Greek yogurt	Fish, poultry, eggs, occasional meat	Include a palm-sized serving or equivalent
Vegetables	Leafy greens, broccoli, peppers, mushrooms, zucchini	Same plant base, with animal protein added	Fill about half the plate
Fiber-rich carbohydrates	Beans, quinoa, oats, sweet potato	Same options, adjusted to activity level	Add a cupped-hand portion
Healthy fats	Avocado, tahini, olive oil, walnuts, seeds	Same choices	Use a small serving for flavor and satiety
Broth or savory liquid	Mushroom, miso, seaweed, or legume broth	Bone broth or plant-based broth	Choose a modest serving and monitor sodium

A vegetarian “broth bowl” might combine mushroom broth, shredded cabbage, tofu, spinach, and sesame seeds. A flexitarian version could use chicken bone broth, greens, and shredded chicken one day, then return to lentil and vegetable soup the next.

Adjust mini-fasting to fit real life

Mini-fasting should be approached as a structured pause between meals, not a competition to eat as little as possible. Some people may find a consistent overnight fasting window comfortable, while others function better with breakfast, lunch, and dinner spaced evenly.

A gentler option is finishing dinner two or three hours before bedtime and delaying breakfast until the next morning. During the eating window, meals should contain enough protein, fiber, and calories to support energy. A vegetarian who relies mainly on vegetables and broth may feel weak if legumes, dairy, eggs, tofu, or grains are missing.

Flexitarians can use broth during a fasting window if it fits their chosen approach, but they should recognize that broth containing protein or calories may technically interrupt a strict fast. Water, unsweetened tea, and black coffee are commonly used during fasting periods, although caffeine can increase anxiety or affect sleep in some people.

Stop or modify the fasting schedule if it causes dizziness, persistent fatigue, headaches, irritability, binge eating, or reduced exercise tolerance. The purpose of the routine is to support consistency, not create distress.

Refresh recipes, snacks, and movement

The book’s recipe style can be adapted with simple substitutions. Replace chicken with tofu or tempeh in stir-fries, use lentils in place of ground meat in lettuce wraps, and add white beans to soups for creaminess and protein. Egg-based frittatas, Greek yogurt bowls, chia puddings, and roasted chickpea salads can add variety across the three weeks.

Snacks should be optional rather than automatic. When needed, choose combinations such as apple with peanut butter, vegetables with hummus, plain yogurt with berries, or edamame with a small piece of fruit. These pairings provide more staying power than refined carbohydrates alone.

Fitness guidance should match the person’s current ability and food intake. Walking, mobility work, resistance training, cycling, and short bodyweight sessions can all fit the plan. Someone eating fewer calories or adapting to fasting may need shorter workouts, additional recovery, or a small pre-workout meal.

Track results beyond the scale

Weight may change during three weeks, but it is only one measure of progress. Track energy, hunger, sleep quality, digestion, waist or clothing fit, exercise performance, and how consistently meals align with personal values.

Vegetarians and flexitarians should pay particular attention to protein adequacy, iron, vitamin B12, calcium, iodine, omega-3 fats, and vitamin D. Plant sources can contribute significantly, but fortified foods or supplements may be appropriate depending on the individual diet and laboratory results.

A simple weekly review can identify what needs adjusting. If hunger is high, increase protein or fiber. If meals feel repetitive, rotate legumes, tofu, eggs, dairy, whole grains, and seasonal produce. If packaged broths make sodium intake excessive, dilute them or prepare a lower-sodium version at home.

A practical customization checklist

• Choose a clear eating pattern: vegetarian, pescatarian, or mostly plant-based flexitarian.
• Select two or three reliable broth alternatives and check their protein and sodium content.
• Include a substantial protein source at each main meal.
• Keep fasting windows moderate and adjust them around work, sleep, exercise, and health needs.
• Prepare flexible staples such as cooked lentils, tofu, roasted vegetables, eggs, quinoa, and soup.
• Review energy, hunger, digestion, and mood each week instead of focusing only on weight.

Use the 21-day plan as a repeatable structure, then make the food fit your body, ethics, schedule, and preferences. Explore the book’s recipes and wellness products with a critical eye, favoring meals that are nourishing enough to sustain daily life. Start with one week of practical substitutions, refine the portions and timing, and carry the most satisfying habits into the remaining two weeks.