When I did my pre op 2 years ago it’s was hard the first two days. The thought of not eating makes you hungry lol. But after that it was a breeze and I lost 20lbs with out any form of exercise.i had a very small list of veggies I could eat with 3.5 oz of lean protein a day so I opted for beef jerky and I roasted the veggies with fat free Italian dressing . Those roasted veggies saved my life lol