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"Normal range" for ALT varies from lab to lab depending on the equipment they use. Your lab report should have the reference range listed right next to the value of 90.
We normally aren't concerned until the level is 2.5 to 3 times the upper level of normal. For instance, if the "normal" for the lab is 5-40, then we don't worry at all until the level is in the 100-120 range. With serious liver problems the levels can go well into the hundreds.
Treatment consists of weight loss, changes in diet to incorporate more vegetables and fewer fats, exercise. People also often have cholesterol problems and these need to be addressed as well.
Please reply if you have additional questions about this.
If you have no more questions, I would appreciate a positive rating, since that is the only way I am paid.
Often we don't worry about ALT until it is 2.5 to 3 times the higher level of normal, which at your lab would mean 135-162. Your doctor is proceeding with an extra measure of caution, probably due to your being overweight and admittedly having poor eating habits. Your cholesterol and triglycerides might also be normal, but at the higher levels of normal. It takes some time at very high levels of liver enzymes to cause cirrhosis. Evidently your previous tests have all been within normal range, so this elevation is something new.
If it is fatty liver, you will have plenty of time to reverse it before damage is done.
If it's fatty liver the only thing that is going to work is healthy diet, avoiding all alcohol, and exercise. Since you are overweight, you should plan to lose 1 to 2 pounds per week. There are no supplements or medications for it. No magic. Just slow and steady.
Your doctor may want to send you to a registered dietitian to get you started on a healthy eating plan.
Please let me know if you have questions.
There really aren't whole books devoted to fatty liver disease. Give me a minute and I will see if I can find some easy to read articles for you.
This is one of the best articles I've seen on the subject: