Gained 20 lbs out of no where! 4 weeks now on vegan 700 cal diet 4 weeks, 20 lbs is STILL there. Blood work normal but high triglycerides. What?!

Simple. Vegan still can consume lots of calories , dos not mean weight loosing diet. You can continue to be a vegan but need to see a nutrition specialist . 700 Cal diet is very low for 21 yr old , even with this diet you gained 5lbs a wk . your calorie count may not be correct , next activity . You have to be very active , do daily regular exercises for next 4 wks , you will be amazed Good Luck.