You get 'wg points' for the crippling hunger, super expensive 'starving to death' cutscene. I ~think~ you could still pull it off if you did some other activities that fake as protein intake - walks in the park, for example, add a +1 to the hidden Protein counter, so you could theoretically go the fit route without manually eating anything if you did enough of that kind of thing.
Try a gym-heavy run while eating protein. Chicken and eggs are safe bets. There's no 'fat gain' from things like the early salads or cucumbers either, so don't feel like you have to starve Trisha to get swole.