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Dec
01

A Holistic Perspective on the Digestive System of Infants and Children

Author // Laurence B. Palevsky, MD

Infants and children are not simply small adults, especially when it comes to feeding and nourishing their little bodies. They are less able than adults to receive, transform and assimilate the nutrients given to them. Infants and children are born with immature digestive systems. Digestive enzymes are not as plentiful and efficient. Intestinal materials, including undesirable particles, are more readily absorbed into the bloodstream through the porous lining of the digestive tract. Their digestive capacity may be weakened and impaired due to an early exposure to poor dietary choices and environmental stressors. This weakness can persist well into adulthood increasing the likelihood of chronic childhood and adult illnesses.


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If children are fed appropriately, their digestive systems will naturally strengthen and mature by age 6 or 7 years. With proper maintenance and barring any genetic or other environmental problems, their digestive systems will continue to strengthen as they grow. Western science, nutritional and functional medicine and Chinese and Ayurvedic medicine teach that the overall health of infants and children correlates with the strength and health of their digestive system. The digestive lining interfaces with the outside world and houses the largest part of a child’s immune system. The nervous system plays a key functional role in maintaining the health of the digestive lining and its immune system. Due to the immaturity of their systems, children require different food choices and preparations.

The digestive system is more than a physical space that provides enzymes, hormones and surface area for digestion. The digestive system is also an energy system, one that is affected by the energy of the food and the environment. The digestive energy system works by generating a certain amount of heat, or kinetic energy, to help ignite the digestive processes. In chemistry lab, stirring and heating are two processes that help drive the efficiency and completion of a chemical reaction. Stirring helps to generate heat, break down molecules and provide greater surface area in order to maximize enzyme efficiency and the completion of a chemical reaction. Digestion is also a series of chemical reactions. In the body, the physical act of chewing food, or the ingestion of food that appears to have already been chewed, accomplishes for digestion what stirring does for chemical reactions:

  • Stirring = Heat + Increased Surface area + Mechanical breakdown of molecules = Efficient, completed chemical reaction
  • Chewing = Heat + Increased Surface area for enzyme activity + Mechanical breakdown of food into smaller particles = Efficient, completed digestion, maximal absorption and assimilation of micronutrients.

Children, and especially infants, have few teeth and rarely chew their foods well. The ingestion of incompletely chewed foods places an undue stress on a child’s digestive and immune systems. The mechanical work of digestion increases. Energy reserves are called on through the work of the autonomic nervous system to help increase the mechanical breakdown of the food. There is a demand for an increase in the secretion of enzymes and digestive juices. Invariably, digestion is incomplete, diarrhea may ensue or larger macronutrients are inappropriately absorbed into the body stimulating an immune system response. Over time, added stress is placed on the digestive, immune and nervous systems, potentially weakening the child’s defense and limiting absorption of important nutrients.

Our bodies are also equipped with an innate ability to generate necessary digestive heat within a narrow range of body temperatures to cook (digest) the foods even further. On the whole, children, and especially infants, have an inherently weak digestive heating system, which I refer to as a weak or flickering pilot light.

Giving a predominance of foods to infants and children that are either cold in temperature or cool in nature may further weaken this fire and reduce the child’s capacity to heat and digest foods efficiently. Foods given to infants and children that are heating in nature, like spicy foods, or prepared under high temperatures, like frying, may also weaken the pilot light. Foods that are heavy and thick will tend to smother the digestive fire as well.

We know that infants and children begin life with a weak pilot light; therefore, it is important to offer them a balance of foods that strengthens, or at the very least, does not weaken it. For optimal digestion, infants and children require foods that are whole, simple, warm, cooked and easy to digest, since they have few if any teeth and are not apt to chew their foods well. Foods that will potentially weaken the digestive fire include those that are cold, both in temperature and in quality; damp, otherwise known for their ability to produce mucus and phlegm; and smothering, those that are heavy and thick in quality. In addition, overfeeding and offering multiple food choice at one time can also weaken children’s digestive fire.

The list of cold, damp and/or smothering foods may seem daunting. Most of the foods that children eat are found on this list. In many cases, adults eat a diet containing many of these foods as well. Nonetheless, the prevalence of these items in children’s diets often contributes to the development of many of the undesirable clinical symptoms that are seen in the pediatric population.

Mucus and inflammation are byproducts of poor digestion. The symptoms that are produced include colic, vomiting, spitting up, constipation, diarrhea, ear fluid and chronic ear infections, fever, chronic nasal congestion, sinusitis, acute and chronic allergies, acute and chronic coughs and asthma and eczema.

An acute illness, like fever, vomiting or diarrhea, is a healthy way for the body to cleanse itself of the accumulation of foods and environmental stressors that are difficult to receive and digest and stressors that have weakened the digestive, immune and nervous systems. With a chronic illness, the child’s body is often unable to cleanse itself of the accumulation of foods and stressors that have weakened the digestive, immune and nervous systems.

There are many environmental factors that can stress a child’s digestive, immune and nervous systems. Aside from the dietary factors listed above, children are exposed to heavy metals, pollutants, solvents and carcinogens found in food, water, air, medicine, plastics and injected materials that can injure the digestive, immune or nervous systems.

Other stressors include poor sleep; disharmony in the home; problems at school or with peer groups; conflicts with siblings and parents; a lack of play time, down time and sufficient exercise; and a lack of attention paid to who children really are and how they are feeling. Children need to be able to digest their environments as well as the foods they ingest.

So what and how to feed infants and children? Optimal foods for infants and children (and for adults) consist of a balance of cooked foods made up of whole fresh vegetables, pre-soaked and well cooked legumes, antibiotic and hormone free meats, poultry and eggs from grass fed animals, wild and ideally mercury-free fish, whole grains, fruits and water. Feed children local foods that are in season.

Healthy cooking methods for children include stewing, pureeing, potting, steaming, boiling, sautéing, baking and roasting, all of which use lower flames for longer periods of cooking time. Soups, casseroles, dips and spreads are fun foods to feed children that provide them with the nutrients they need. One way to enhance the flavor of these foods is to add warming culinary herbs either while cooking or before serving. Many of them can be hidden or blended into foods or made into teas.


Some of these culinary herbs are used to treat many of the common ailments frequently brought on by food choices that produce mucus and inflammation and weaken the digestive system. While it is hard to avoid many of the cold, damp and smothering foods, culinary herbs help to counter balance the weakening effects these foods have on a child’s digestive and immune systems.

Most of the chemicals that make up the body’s immune system are derived from the diet we feed our children. The proteins, fats and carbohydrates in our food become the amino acids, fatty acids and saccharides of pro- and anti-inflammatory chemicals in the immune system. These nutrients also stimulate the activity of the sympathetic and parasympathetic branches of the autonomic nervous system in different ways specific to each individual child.

Most of the vitamins, minerals and water needed as co-factors for these reactions are derived from the diet as well. A diet of foods that contain healthy proteins, fats, carbohydrates, vitamins, minerals and water will feed the immune and nervous systems the necessary nutrients for maintaining health and homeostasis. A weakened and stressed digestive system in a child is more likely to contribute to a state of acute and/or chronic moisture, especially along the digestive lining, than one that is balanced, supported and nurtured with the proper nutrients and environment.

A child’s body consists of almost 70% water. Water is the best beverage for children and adults. A diet of salty and sweet beverages and foods has a dehydrating effect on the body as does a low consumption of water. The body naturally responds to dehydration by increasing the production of mucus membranes. This moisture appears as an increase in mucus production, most often in the airways, nasal passages, oropharynx, intestines, and skin, sometimes even as rashes or inflammation. Excess mucus is produced in these areas to maintain hydration and a strong defense against invading pathogens. Over time, an increase in mucus production can be excessive, often providing an ideal environment for bacterial or viral growth.

If a child’s system is strong enough, he or she will get sick and burn off the excess mucus, usually with a fever, to restore the proper lining of the mucus membranes. If the child is not strong enough, or continues to be given too much salt and sugar, overproduction of mucus in the body will continue. By lifting the burden of excess sugar and salt in the diet and offering water as the main beverage, a child’s body can then use its innate healing ability to clear the excess mucus and restore homeostasis to the defense system.

When a child presents with any of the above undesirable symptoms or illnesses, a switch to a diet of whole, simple foods and a reduction and/or elimination of the cold, damp or smothering foods will often alleviate many, if not all, of the clinical problems. In so doing, the child’s digestive, immune and nervous systems will become stronger, allowing him or her to better deal with external environmental stressors. In many cases this normal healing process occurs without complication or even an awareness that it is happening in the body at all.


Items that are cold and damp in quality to a child’s digestive fire include:

  • Dairy products (milk, cheese, sour cream, yogurt, ice cream)
  • Soybeans and processed soy products (soy milk, soy cheese, TVP, soy bars, soy burgers, soy powders)
  • Commercial infant formulas (milk and soy based)
  • Other commercial milks, e.g., rice milk
  • Raw fruits and raw vegetables
  • Wheat and most flour products
  • Baby cereals and commercial cereals


Items that are smothering in quality to a child’s digestive fire include:

  • Wheat and most flour products
  • Baby cereals
  • Heavy, thick fruits, e.g., bananas
  • Thick, creamy foods
  • Greasy, oily foods
  • Juice, soda, soft drinks, shakes, smoothies
  • Sugar, high fructose corn syrup, etc.
  • Artificial sweeteners
  • Fried foods and oils, foods cooked under high heats
  • Iced or refrigerated foods and beverages
  • Peanuts
  • Processed, packaged and refined foods with dyes, chemicals, preservatives, additives, metals, colorings, partially hydrogenated oils,margarine, shortening
  • Antibiotics



Pathways Issue 12 CoverThis article appeared in Pathways to Family Wellness magazine, Issue #12.

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