A Big Mac you mention is 25.5 syns so you won't eat it now and blame it as cause of your weight gain.
Eating one would be classed as off plan.
A big mac is 493 calories
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This is a Slimming world alternative the 'big daddy burger' for 0.5 syn with HEB or 6.5 syns. Its off their website bear in mind, and not a random insta hun recipe
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If you put the ingredients listed into nutracheck its more calories than a big mac (this not including the syn free chips you'd likely have with it)
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Yet you could eat 3 of these if you use one of your buns as heb and still be on plan and under 15 syns.
So, if you ate the big mac you'd probably watch what you ate for the rest of thr day because its a big mac and we associate it as high calorie and fattening.
If you eat the half a syn 'big daddy burger' you'd likely enjoy another 14.5 syns, a heA, breakfast and lunch on top.
Your consultant would even tell you that you need to eat all these things.
You could walk into and eat a big daddy burger monday - saturday and only eat a big mac on the sunday.
If you gained your consultant will blame the big mac.
Demonising a food for no reason.
Syns are loads of shit.