The topic at hand is about whether it's safe and effective for someone with an ileostomy to use Alli diet pills, which are over-the-counter fat-blocking pills, to help lose weight. The person is concerned about potential side effects, especially since they have no large colon. Here are some insights and advice shared by others with similar experiences:

1. Concerns about oily output:
- One person with an ileostomy had a negative experience using prescription-strength orlistat, which is similar to Alli. They experienced extremely oily output that caused their pouch to detach, leading to abdominal pain and a hospital visit. The oiliness undermined the adhesive of their pouch, causing leaks.

2. Positive experience with careful fat intake:
- Another person successfully used Alli for three months, losing 16 pounds without any pouch failures. They emphasized the importance of strictly following the recommended fat intake per meal to avoid oily output. They suggest stopping the use of Alli immediately if any problems arise.

3. General cautions and considerations:
- There is a concern that Alli might affect vitamin E absorption, potentially increasing bleeding risk, though this was not confirmed. It's advised to seek medical advice for such concerns.
- If fish-oil capsules have caused oily output in the past, Alli might have a similar effect.

4. Alternative weight-loss approaches:
- One person tried an alkaline diet, which involves eating high-alkaline and low-acid foods. They lost a significant amount of weight and reported improved stoma function and overall health.
- Another person followed a modified HCG diet, which includes using HCG, drinking plenty of water, and maintaining a higher calorie intake than the traditional protocol, combined with exercise. They reported no issues with their stoma.

5. Practical tips:
- If you decide to try Alli, monitor your fat intake carefully.
- Choose a stoma appliance that adheres well, especially if your output tends to be thinner or greasier. Some find a convex two-piece appliance more secure.
- Be ready to stop using Alli immediately if you experience leaks, excess oil, or abdominal pain.