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The *Classic of Internal Medicine* states: "When food and drink intake doubles, the intestines and stomach are injured." Li Dongyuan said: "Drinking belongs to formless Qi (vital energy); eating belongs to formed Blood (nutritive substance)." From this, we can deduce that milk belongs to the category of blood and is a type of drink; grains contain dregs and belong to the category of solid food. Milk and grains are originally not of the same category; how can they not be distinguished?

Regarding syndromes in children where diet injures the spleen and stomach, one cannot generalize. There are injuries caused by cold, injuries caused by heat; there are acute diseases and chronic diseases; there are deficiency syndromes and excess syndromes. However, cases of heat, acute onset, and excess are easily understood by people; whereas cases of cold, chronicity, and deficiency are often unrecognized. For example, modern children who suffer from abdominal pain and diarrhea due to consuming raw, cold fruits and vegetables damaging the Stomach Qi are still treated as having heat-fire syndromes with cold-natured drugs. This is a failure to recognize cold syndromes. Some experience distension and pain due to occasional stagnation, which everyone knows is an excess syndrome. Yet, those whose Spleen and Stomach are inherently strong will easily transform even if there is stagnation; only those unable to transform it will frequently present with fullness and distension. Others may feel hungry without eating but become bloated after eating little, or have no sense of hunger or satiety and completely lose their appetite, or fail to desire food for a long time due to illness damaging Stomach Qi. These are essentially not excess syndromes. When physicians encounter such cases, regardless of whether there is excess or deficiency, few refrain from using digestive and guiding agents. This is a failure to recognize deficiency syndromes. The Spleen and Stomach originally possess the function of transportation and transformation. Now that they cannot digest food, their functional authority has been lost. Can one still focus on using harsh draining and reducing methods, thereby increasing their distress? Therefore, to treat disease, one must first rely on Stomach Qi as the master to guide the action of medicines. If Stomach Qi is strong, attacking pathogens removes them, and diseases heal easily because strong Stomach Qi facilitates the movement of medicinal power. If Stomach Qi is weak, attacking pathogens does not remove them. This is not because the medicine fails to remove the disease, but because the Stomach Qi is inherently weak; attacking further weakens it, causing medicinal power to fail to move, the Stomach to be more injured, and the disease to worsen. Furthermore, differences in constitution exist. Children of commoners, with robust constitutions, and those with newly acquired acute diseases, are suitable for clearing and draining methods, aiming for rapid removal of pathogens. Conversely, applying urgent attacking treatments indiscriminately to children with weak constitutions and illnesses, without considering deficiency or excess, leads to danger.

Those who habitually prefer cold foods necessarily have internal heat; those who habitually prefer hot foods necessarily have internal cold. Thus, those with internal cold dislike cold; those with internal heat dislike heat. However, those who crave cold often develop middle-jiao cold, and those who crave heat often develop internal heat. As stated in the *Inner Canon*: "Prolonged influence increases Qi, which is the normal transformation of things; increased Qi lasting long is the cause of premature death." Physicians must observe the drawbacks of habitual preferences within the patient's innate constitution.

Diseases caused by diet resulting from heat often manifest as fire syndromes with less stagnation; those caused by cold often manifest as stagnation without any fire syndrome. Generally, dietary injuries are mostly due to cold-natured foods, followed by neutral-warm foods. Heat facilitates decomposition and circulation, so stagnation is rare.

Feng Chuzhan said: "All childhood food stagnation stems from weak Stomach Qi. Contemporary physicians use Pingwei San (Stomach-Pacifying Powder) as the standard for treating Spleen and Stomach disorders. Who realizes that Pingwei San acts like leveling high ground? Once leveled, stop; do not overdose, or flat land becomes a pit." It is superior to Zhishi Wan (Immature Bitter Orange Pill), formulated by Elder Jiegu, using 1 liang of Zhishi (Aurantii Fructus Immaturus) and 2 liang of Baizhu (Atractylodis Macrocephalae Rhizoma). It tonifies more than it drains, tonifying first then draining. However, this pill was originally designed for food stagnation; using it solely as a Spleen-tonifying medicine today is erroneous. Zhishi has the power to push down walls; improper use causes excessive depletion. Consider Shan Zha (Crataegi Fructus), Shen Qu (Massa Medicata Fermentata), and Mai Ya (Hordei Fructus Germinatus), commonly used worldwide. Shan Zha resolves meat accumulation; even tough old sow meat disintegrates instantly with a pinch of Shan Zha. It also resolves postpartum uterine lochia pain (Zhen Tong). Its ability to break stagnation is potent; how can it be used lightly? Shen Qu and Mai Ya are used because rice in a porcelain jar requires Qu (fermented starter) to make wine and Mai Ya to make sugar. The human Spleen and Stomach are not like a porcelain jar; they naturally digest food. When food does not digest, the organ responsible is diseased. Tonify its functional capacity, and food will digest naturally. Why use such draining medicines?

Children with complete Yuan Qi (Original Qi) and strong Spleen and Stomach can eat much without injury and feel hungry only when overdue. Children with insufficient fundamental Qi and deficient Spleen and Stomach are easily injured by overeating. If attacking methods are used, although food is digested, the Spleen Qi is further depleted by this draining process. Later, food fails to digest again. If one believes previous medicines were effective and continues administering decoctions and pills, the harm compounds, leading to emaciation. This is tragic. Physicians treat the poor and the rich differently. Noble youths differ from commoners; peaceful citizens differ from those with war wounds. Strong men in villages suffering sudden trauma heal quickly with one dose of attacking medicine. However, noble children with weak constitutions, pampered and fragile, should not be treated identically with attacking methods, lest great harm ensue.

Chuzhan said: Although Spleen and Stomach digest food, this relies on the interplay of Water and Fire Qi, not just the organs themselves. Excess internal fire makes Spleen and Stomach dry; excess water makes them damp. Neither can transport and transform effectively, leading to disease. In Xiao Ke (Wasting-Thirst Syndrome), fire is excessive and water cannot control it. In Shui Zhong (Edema Syndrome), water is excessive and fire cannot transform it. One must regulate the imbalance to restore equilibrium. "Regulating" does not mean removing water or fire. Water and Fire in the body are naturally balanced; imbalance is pathology. If fire is excessive, supplement water to balance fire, do not remove fire. If water is excessive, supplement fire to balance water, do not remove water. Like a balance scale, if one side is heavy, add weight to the light side; never remove weights, as they are fixed quantities. Modern practitioners who drain water when seeing edema or purge fire when seeing heat are like those removing weights from a scale.

Childhood diseases most frequently involve food stagnation. When milk and food stagnate and fail to transform in the Middle Jiao, symptoms include fever, aversion to food, belching with sour taste, aversion to food odors, retching without vomiting, vomiting sour fluid, shortness of breath with chest stuffiness, abdominal pain, and crying. These are signs of food stagnation. The appropriate treatment is to reduce intake ("Sun"). "Reducing" means temporarily withholding food to allow self-transportation. The *Classic* states: "For mild injuries, reducing food intake leads to recovery." If reduction does not alleviate symptoms, use Weiling Wan (Stomach-Calm Pill) to regulate. If regulation fails, use Baohe Wan (Preserve Harmony Pill) to guide out stagnation. If guiding fails, use purgative methods. For mild cases, use Muxiang Binglang Wan (Costus and Areca Nut Pill); for severe cases, use Xiaoji Wan (Eliminate Accumulation Pill).

Food stagnation is critical. Untreated, it becomes Ji (accumulations) or Pi (masses). Improperly treated, it develops into Gan (infantile malnutrition) or Lao (consumption). Robust children with strong Spleen and Stomach, indulged by parents, overeat, causing true food stagnation. Treat with the aforementioned methods. Weak children with deficient Spleen and Stomach, who eat little or slightly increase intake and experience stagnation, suffer from Spleen deficiency failing to transform grain and slow transportation. This is not true food stagnation; treating it as such is an error. Use Liu Junzi Tang (Six Gentlemen Decoction) to assist healthy transportation; prolonged use leads to recovery.

Children with strong Spleen and Stomach who indulge their appetites without restraint double their intake, injuring intestines and stomach, turning excess into deficiency. Children with weak constitutions who regulate their diet avoid intestinal and stomach injury, allowing Gu Qi (Grain Qi) to grow, eventually turning deficiency into strength.

After vomiting and diarrhea from food stagnation, the offending matter is expelled. Harmonize Stomach Qi using Yigong San (Extraordinary Power Powder) or Liushen Wan (Six Spirits Pill).