diff --git a/lib/determine-basal/determine-basal.js b/lib/determine-basal/determine-basal.js
index d9e1fb666..f428ba278 100644
--- a/lib/determine-basal/determine-basal.js
+++ b/lib/determine-basal/determine-basal.js
@@ -557,7 +557,7 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
     zeroTempEffect = round(zeroTempEffect);
     carbsReq = round(carbsReq);
     console.error("bgUndershoot:",bgUndershoot,"zeroTempDuration:",zeroTempDuration,"zeroTempEffect:",zeroTempEffect,"carbsReq:",carbsReq);
-    if ( carbsReq > 0 ) {
+    if ( carbsReq >= profile.carbsReqThreshold ) {
         rT.carbsReq = carbsReq;
         rT.reason += carbsReq + " add'l carbs req + " + minutesAboveMinBG + "m zero temp; ";
     }
diff --git a/lib/profile/index.js b/lib/profile/index.js
index 9f6932a92..3d3a47f91 100644
--- a/lib/profile/index.js
+++ b/lib/profile/index.js
@@ -37,6 +37,7 @@ function defaults ( ) {
     , curve: "bilinear"
     , useCustomPeakTime: false
     , insulinPeakTime: 75
+    , carbsReqThreshold: 1
   };
   return profile;
 }