With an ostomy or a jpouch calorie absorbption should not be compromised and yes, if you consume 100 calories you will absorb 100 calories. The absorbption of calories takes place in the terminal ileum and it doesn't matter how quick your transit time is you will absorb all calories ingested.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free