1. This instruction refers to the manufacture and use of low pH buffered nutrients in the method of regulating the acidity of the stomach and / or the method of improving the air feeding speed of the main stomach； Each method includes at least one management phase of a low pH buffered nutrient. Claim 1: a method of maintaining resistance to bacterial growth in the gastrointestinal tract of the subject. In the gastrointestinal tract, the bacteria are selected from the group of Enterobacter coli (ecep),Escherichia coli (ECEA)The method is characterized in that it includes a nutrient management stage, with pH buffer strength ranging from about 9 to 22, wherein the nutrient component includes at least one salt, and its components are: He has a pKa less than 4. Requirement 2: the method conforming to requirement 1 is characterized in that the nutritional composition is a formula for children. Requirement 6: method according to requirement 4,It is characterized by nutritional composition including protein sources, and the ratio of serum to BCG varies from about 60:40 to about 80:20. Claim 9: the method of claim 1 is characterized in that at least one salt with PKA lower than 4 is selected from glucose, calcium lactate, calcium chloride, calcium phosphate and any combination thereof. 11. Claim 11: the method according to claim 10, which is characterized in that the pre biological component includes polyhydroxyketone.La presente se refiere a la manufactura y uso de composiciones nutricionales de baja amortiguación de pH en métodos para modular la acidez gástrica y/o en métodos para mejorar la velocidad de vaciado gástrico en un sujeto, cada método comprende una etapa de administración de por lo menos una de dichas composiciones nutricionales de baja amortiguación de pH a un sujeto. Reivindicación 1: Un método para sustentar la resistencia contra el crecimiento de la bacteria en el tracto gastrointestinal de un sujeto, en donde la bacteria es seleccionada del grupo que con
