Retrieve the labels of a food

I have a Many To Many relationship between Food and Labels. The problem is that when I want to edit a food in the view to edit it, I want to retrieve the different assigned labels but these are collected in the creation view through a checkbox and I would like the marked checkbox to appear in the edit view.

Next I put the code that I am using:

• AlimentoController:

  public function create() {
  return view('Alimento/crear');
  }
  
  public function store(Request $request)        {
  $this-> validate($request,
  ['nombre'=>'required', 'kcal'=>'required', 'proteinas'=>'required', 'carbohidratos'=>'required','grasas'=>'required'  ]);
  
  $etiqueta=new Etiqueta();
  $alimento = new Alimento();
  
  $alimento->nombre = $request->nombre;
  $alimento->kcal = $request->kcal;
  $alimento->grasas = $request->grasas;
  $alimento->proteinas=$request->proteinas;
  $alimento->carbohidratos=$request->carbohidratos;
  
  $etiqueta->etiqueta=$request->etiqueta;
  $alimento->etiquetas()->attach($etiqueta->id);
  
  $etiqueta->save();
  $alimento->save();
  
  }
  
  public function edit($id) {
  $alimento = Alimento::find($id);
  $etiquetas= $alimento->etiquetas();
  return view ('Alimento/editar')->with(['alimento'=>$alimento, 'etiquetas'=>$etiquetas]);
   }
  
  public function update(Request $request, $id){
  
  $this-> validate($request,
      ['nombre'=>'required', 'kcal'=>'required', 'proteinas'=>'required', 'carbohidratos'=>'required',
          'grasas'=>'required'  ]);
  
  
  $alimento = Alimento::find($id);
  $etiqueta = $alimento->etiquetas();
  
  $alimento->nombre = $request->nombre;
  $alimento->kcal = $request->kcal;
  $alimento->grasas = $request->grasas;
  $alimento->proteinas=$request->proteinas;
  $alimento->carbohidratos=$request->carbohidratos;
  $etiqueta->etiqueta=$request->etiqueta;
  
  
  
  $etiqueta->save();
  $alimento->save();
  
  if($alimento->save()){
      return redirect('alimentos');
  }else{
      return back()->with('nmsj','No se ha actualizado el alimento correctamente');
  }
  
  }
  

• Create-Food View (code portion to collect the labels):

<div class="checkbox">
<label><input type="checkbox" name="etiqueta" value="pescados"><strong>Pescados y mariscos</strong></label>
</div>
<div class="checkbox">
<label><input type="checkbox" name="etiqueta" value="carnes"><strong>Carnes y derivados cárnicos</strong></label>
 </div>
 <div class="checkbox">
 <label><input type="checkbox" name="etiqueta" value="huevos"><strong>Huevos</strong></label>
 </div>
 <div class="checkbox">
 <label><input type="checkbox" name="etiqueta" value="cereales"><strong>Cereales</strong></label>
 </div>

• Edit-Food View (portion of code to retrieve labels)

<div class="checkbox">
<label><input type="checkbox" name="etiqueta" value="pescados" {{$alimento->etiquetas()=='pescados' ? 'checked':''}}><strong>Pescados y mariscos</strong></label>
 </div>
 <div class="checkbox">
 <label><input type="checkbox" name="etiqueta" value="carnes" {{$alimento->etiquetas()=='carnes' ? 'checked':''}}><strong>Carnes y derivados cárnicos</strong></label>
  </div>
  <div class="checkbox">
  <label><input type="checkbox" name="etiqueta" value="huevos" {{$alimento->etiquetas()=='huevos' ? 'checked':''}}><strong>Huevos</strong></label>
  </div>
  <div class="checkbox">
  <label><input type="checkbox" name="etiqueta" value="cereales" {{$alimento->etiquetas()=='cereales' ? 'checked':''}}><strong>Cereales</strong></label>
 </div>

Thank you very much!