Exercise To Lose Weight

I Know This Person Who Eats Frozen Meals (healthy Choice, Lean Cuisine,etc) Everyday. They Add Salt To It When It Already Has 800 Mg Of Sodium. They Ass Salt To Everything. They "claim" To Be Trying To Lose Weight But They Never Exercise. I Was Wondering If It Was In Any Way Possible For Them To Lose Anything.this Person Is About 5'2 350 Pounds African American Female Early 40's With Extremely Bad Knees. There Are No Underlying Health Conditions And The Have High Blood Pressure.