In a low cholesterol meal plan, recommended portion sizes focus on maintaining a balanced diet while controlling calorie and fat intake. Aim for approximately 3-4 ounces of lean cuts of meat, such as chicken, turkey, fish, or plant proteins per meal. Include a variety of colorful fruits and vegetables, aiming for at least 1-2 cups of vegetables and 1 cup of fruits each day. Incorporate whole grains like brown rice or quinoa, limiting the portion to about 1/2 to 1 cup per serving. Use healthy fats, like a tablespoon of olive oil or a handful of nuts, in moderation. Avoid oversized portions and prioritize nutrient-dense foods to support heart health effectively.