Are banana milkshakes ok for weightloss?

I'm on 2 weeks annual leave & I want to get my exercise back on track.

I'm going to walk 10k steps plus a 15 min HIIT workout. Monday - Friday.

I eat plain porridge for breakfast & I usually make a sandwhich but was going to make a banana or frozen Strawberry smoothie instead. Also not eat in between meals.

Is a banana or frozen Strawberry smoothie ok for lunch? It's also quicker to make.

Thank you

Are banana milkshakes ok for weightloss?
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