← Back to Search

Dietary Supplement

BIG MACS Diet for Colon Cancer

Phase < 1
Waitlist Available
Led By Cyrus Jahansouz
Research Sponsored by University of Minnesota
Eligibility Criteria Checklist
Specific guidelines that determine who can or cannot participate in a clinical trial
Must have
Primary diagnosis of colon cancer, stages 1-3
Age 25-70 years
Must not have
Previous organ transplantation
Self-reported HIV-positive status, active tuberculosis, active malaria, chronic hepatitis B or C, cirrhosis, or inflammatory bowel disease
Timeline
Screening 3 weeks
Treatment Varies
Follow Up baseline, time of surgery, postop day 7 and 30
Awards & highlights
No Placebo-Only Group

Summary

This trial will test a special diet to help colorectal cancer surgery patients. The diet aims to improve outcomes by providing beneficial bacteria with more carbohydrates.

Who is the study for?
This trial is for English-speaking adults aged 25-70 with a primary diagnosis of colon cancer stages 1-3, who can consent and follow the study protocol. Excluded are those with significant health issues like anemia or liver problems, BMI <20 or >40, psychiatric conditions affecting adherence, history of substance dependency within five years, certain surgeries or diseases (like IBD), and pregnant/nursing individuals.
What is being tested?
The BIG MACS Diet aims to optimize gut microbiome before colorectal surgery by providing more microbiota accessible carbohydrates compared to a standard diet. The goal is to see if this special diet improves patient outcomes after surgery.
What are the potential side effects?
Since this trial involves dietary changes rather than medication, side effects may include gastrointestinal discomfort such as bloating or changes in bowel habits due to increased fiber intake from the BIG MACS Diet.

Eligibility Criteria

Inclusion Criteria

You may be eligible if you check “Yes” for the criteria below
Select...
My colon cancer is in stage 1, 2, or 3.
Select...
I am between 25 and 70 years old.

Exclusion Criteria

You may be eligible for the trial if you check “No” for criteria below:
Select...
I have had an organ transplant.
Select...
I have HIV, active tuberculosis, malaria, hepatitis B or C, cirrhosis, or inflammatory bowel disease.
Select...
I have had a severe infection in my abdomen before.
Select...
I have had surgery on my stomach, intestines, pancreas, bile duct, gallbladder, or spleen.
Select...
I have significant anemia or a history of bleeding disorders.
Select...
I am 25 years old or younger, or 70 years old or older.

Timeline

Screening ~ 3 weeks
Treatment ~ Varies
Follow Up ~baseline, time of surgery, postop day 7 and 30
This trial's timeline: 3 weeks for screening, Varies for treatment, and baseline, time of surgery, postop day 7 and 30 for reporting.

Treatment Details

Study Objectives

Study objectives can provide a clearer picture of what you can expect from a treatment.
Primary study objectives
Bowel emptying patterns
Change in muscle mass
Compliance with the dietary intervention or standard of care- Baseline veggie meter
+8 more
Secondary study objectives
Change in microbiome features- alpha diversity
Change in microbiome features- beta diversity
Changes in body composition- abdominal muscle
+5 more

Awards & Highlights

No Placebo-Only Group
All patients enrolled in this study will receive some form of active treatment.

Trial Design

2Treatment groups
Experimental Treatment
Active Control
Group I: BIG MACS DietExperimental Treatment1 Intervention
Participants will be instructed to consume the study diet, referred to as the 'BIG MACS Diet' and one protein shake per day for 4 weeks prior to surgery (SOC). Following surgery, participants will continue to follow the BIG MACS Diet for an additional four weeks, with solid food reintroduction after surgery as early as tolerated.
Group II: Standard DietActive Control1 Intervention
Participants receiving only standard of care (SOC) nutrition advice, which is SOC Dietary Instructions, as provided by routine surgical consults and one protein shake per day for 4 weeks prior to surgery (SOC).

Find a Location

Who is running the clinical trial?

University of MinnesotaLead Sponsor
1,428 Previous Clinical Trials
1,620,660 Total Patients Enrolled
Cyrus JahansouzPrincipal InvestigatorUniversity of Minnesota

Media Library

BIG MACS Diet (Dietary Supplement) Clinical Trial Eligibility Overview. Trial Name: NCT05658263 — Phase < 1
Colon Cancer Research Study Groups: Standard Diet, BIG MACS Diet
Colon Cancer Clinical Trial 2023: BIG MACS Diet Highlights & Side Effects. Trial Name: NCT05658263 — Phase < 1
BIG MACS Diet (Dietary Supplement) 2023 Treatment Timeline for Medical Study. Trial Name: NCT05658263 — Phase < 1
~5 spots leftby Nov 2025