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Most Lipids in a cell have ester bonds (made up of glycerol and fatty acids).

I have learned in my chemistry class that we can hydrolyze an ester by simply adding water to it.

$$\cee{CH3COOCH2CH3 + H2O <=>[H^+ (aq)] CH3COOH + EtOH}$$

Then why do lipids which have an ester bond don't hydrolyze inside a cell which is 70 percent water? While searching throught web I have found this link which explains of different ways to hydrolyze an ester. In that it explains about how to hydrolyze esters using dilute acids like HCl. In our stomach HCl is present so logically HCl should destroy the ester in stomach lining (which are made up of cells) instantaneonusly, but this is not happening. Why?

Most Lipids in a cell have ester bonds (made up of glycerol and fatty acids).

I have learned in my chemistry class that we can hydrolyze an ester by simply adding water to it.

$$\ce{CH3COOCH2CH3 + H2O <=>[H^+ (aq)] CH3COOH + EtOH}$$

Then why do lipids which have an ester bond don't hydrolyze inside a cell which is 70 percent water? While searching throught web I have found this link which explains of different ways to hydrolyze an ester. In that it explains about how to hydrolyze esters using dilute acids like HCl. In our stomach HCl is present so logically HCl should destroy the ester in stomach lining (which are made up of cells) instantaneonusly, but this is not happening. Why?

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Most Lipids in a cell have ester bonds (made up of glycerol and fatty acids).

I have learned in my chemistry class that we can hydrolyze an ester by simply adding water to it.

$$\cee{CH3COOCH2CH3 + H2O <=>[H^+ (aq)] CH3COOH + EtOH}$$

Then why do lipids which have an ester bond don't hydrolyze inside a cell which is 70 percent water? While searching throught web I have found this link which explains of different ways to hydrolyze an ester. In that it explains about the how to hydrolyze esters using dilute acids like HCl. In our stomach HCl is present so logically stomach linings(which are made up of cells) should destroy the ester instantaneonusly, but this is not happening. Why?

Most Lipids in a cell have ester bonds (made up of glycerol and fatty acids).

I have learned in my chemistry class that we can hydrolyze an ester by simply adding water to it.

$$\cee{CH3COOCH2CH3 + H2O <=>[H^+ (aq)] CH3COOH + EtOH}$$

Then why do lipids which have an ester bond don't hydrolyze inside a cell which is 70 percent water? While searching throught web I have found this link which explains of different ways to hydrolyze an ester. In that it explains about how to hydrolyze esters using dilute acids like HCl. In our stomach HCl is present so logically HCl should destroy the ester in stomach lining (which are made up of cells) instantaneonusly, but this is not happening. Why?