Healthy amount

one can usually loses 1 to 2 lbs a week but u should start with 1 lbs/week for a couple if weeks to ease yourself into it.

1. buy a food scale (the most important tool u will need)
2. set up a profile with an easy goal at first (start with .5 or 1lbs a week for the first 2 weeks to ease ur body into it). MFP will give u a daily allowance so u dont need to figure it out yourself.
3. LOG everything u eat EVERYDAY
4. only eat back half of the calories u burned at most if u pick up exercising
5. join an online challenge (optional)
6. ditch any non supportive friends
7. donate all junk foods (ASAP)
8. dont tell people that u r trying to lose weight coz most will tell u to EAT MORE (smile n ignore them if they do but do not give in coz u have a goal n they dont)
9. google search for recipes if needed

GOOD LUCK

you have 26lbs to lose so 0.5-1lb per week is appropriate/healthy.