Less than vs. lesser than

i am not really sure but i think both are correct, but the first one is used more, but i hope someone confirms it.
good luk

Thanks, soumaya, for sharing your thoughts. Yes, I do hope someone confirms it.

Anyone in this forum, please confirm or advise. Thanks.

You can count calories, so you need fewer.

Rice has fewer calories than bread.

I see 'fewer' is more appropriate in that context. Thank you for your correction.

With regard to my question earlier, when do we use 'less than' vs. 'lesser than'?
Could you please give an example as well?

I can't think of when "lesser than" is appropriate. Use "less than" the same way you use "fewer than" but when you can't count what is being compared.

Bread is of less nutritional value than rice.
Bread has fewer nutrients than rice.

The cost of A is less than B. (You don't count "cost.")

Hi GG,

My question

Is 'less calories' acceptable in casual speech? I'm asking because I know that it's very common for natives to say 'less people' which should be 'fewer people'.

I can't really comment on what's acceptable. Many things are used in casual speech that make me cringe.

Less people, between you and I, me and Mary went to the movies, etc. etc.

Is it used? Certainly.