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As it has been 3 weeks since you have started treatment, you can go back to your regular diet regime.
But do it gradually . Not in one ago. You can slowly get back to your normal diet over a period of one month
But be careful and try not to have much of fast food ( Chinese foods especially). Take plenty of oral fluids. Drink only purified water. That should be enough.
Better check your blood once again for Typhoid
. It is negative you need not worry.
Wish you a healthy life